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This cheesy kraft macaroni and cheese tuna casserole recipe proves that adding flaky tuna turns a simple box into a hearty, nostalgic upgrade for weeknight dinners.
I developed this recipe after realizing how easy it is to boost the nutrition of a childhood favorite without sacrificing that creamy, cheesy goodness we all love.
The secret lies in layering the familiar with a simple but powerful addition—tuna—that adds hearty texture and hidden protein while keeping the process effortless.
This one-pan dinner requires just 15 minutes of prep and 30 minutes in the oven, making it perfect for busy evenings when you still want a homemade meal.
The Kraft macaroni and cheese box handles the base—no complicated sauces or advanced techniques—while canned tuna, frozen peas, and a few pantry staples elevate it into something heartier and more balanced. The result is a dish that satisfies cravings while quietly delivering nutrients, proving comfort food can be smart too.
By the time it emerges from the oven, you'll have a bubbling, golden casserole with tender pasta, melted cheese, and flakes of tuna throughout—each bite delivering that nostalgic flavor with a satisfying bite.
The peas add a touch of freshness that cuts through the richness, while the crispy top layer makes every mouthful worth the wait. This is the kind of meal that disappears quickly, leaving only empty plates and happy faces behind.
Serve it with a simple side salad or crusty bread to soak up any extra sauce, and you've got a complete dinner that feels like a hug from your grandmother's kitchen.
The beauty of this recipe is its flexibility—swap in different vegetables, use different cheeses, or even add a splash of milk for extra creaminess. Let's get cooking and bring back the joy of simple, satisfying meals.
Ingredients for kraft macaroni and cheese tuna casserole
Six ingredients from your pantry plus a few fresh touches—this casserole comes together faster than takeout.
| Ingredient | Amount | Notes |
|---|---|---|
| Kraft Macaroni and Cheese Powder 🧀 | 1 box | Original or cheddar flavor |
| Flaked Tuna in Water 🐟 | 2 cans | Drained, not oil-packed |
| Frozen Peas 🌽 | 1 ½ cups | Thawed, no need to drain |
| Shredded Cheddar Cheese 🧀 | 1 ½ cups | Extra-sharp for bold flavor |
| Milk 🥛 | 2 cups | Whole milk for creaminess |
| Butter 🧈 | 2 tbsp | Unsalted, melted |
| Garlic Powder 🧄 | ½ tsp | For subtle depth |
| Onion Powder 🧅 | ½ tsp | Enhances savory notes |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground preferred |
| Salt 🧂 | ½ tsp | Adjust to taste |
| Breadcrumbs 🍞 | ½ cup | Panko for extra crunch |
| Melted Butter 🧈 | 2 tbsp | For breadcrumb mix |
| Green Onions 🧅 | 2 whole | Chopped, for garnish |
The Kraft box is your shortcut to cheesy perfection, but don’t skip the milk—it’s what turns that powder into a creamy sauce. Whole milk gives the best texture, but any milk works. For the tuna, Starkist or Chicken of the Sea are my go-tos—they flake perfectly. Frozen peas? Grab the no-salt-added kind from the store freezer section—it’s cheaper and you control the seasoning. The cheddar? Extra-sharp makes all the difference, but pre-shredded works if you’re in a hurry (just toss it with flour to avoid clumping).
No breadcrumbs? Crushed crackers or cornflakes work in a pinch—just toast them first for crunch. Short on green onions? Skip them or use dried chives at half the amount. The garlic and onion powders are non-negotiable for flavor, but if you’ve got fresh, 1/4 tsp each will do. For a creamier casserole, add 1/4 cup sour cream to the milk mix. And if you’re feeling fancy, swap the peas for corn or diced carrots—whatever you’ve got on hand.
This casserole reheats beautifully—just cover it with foil and pop it in the oven at 350°F for 15-20 minutes. Leftovers keep for 4-5 days in the fridge, but honestly, it’s gone by then. For meal prep, assemble it the night before and refrigerate uncovered so the top gets extra crispy. Freezes for 3 months, but the texture gets a little softer after thawing. Garnish with green onions right before serving—they add freshness that cuts through the richness.
Why You'll Love This Recipe
- One-Pot Magic: I swear by this—just dump the mac and cheese powder into boiling water, stir in the tuna and peas right out of the can, then top it with that melty cheddar. No chopping, no measuring cups, no mess. My weeknights thank me every time.
- Salty-Sweet Crunch: That moment when the tuna flakes get crispy under the broiler? Chef’s kiss. The cheddar stretches into gooey strands, the peas add a bright pop, and the tuna’s ocean-y bite cuts through the richness. It’s the kind of dish that makes you forget it’s basically a boxed meal.
- Lunchbox Hero: Between us, this is my go-to for meal prep. I make a big batch on Sunday, portion it into containers, and toss them in lunches—no reheating needed. Kids (and adults) love it cold or warmed, and it’s the only thing that keeps my picky eater from trading his lunch for the cafeteria’s mystery meat.
- Pantry Superstar: Honestly, I keep this in my back pocket for emergencies. A can of tuna, a bag of frozen peas, and a box of mac and cheese? That’s $5 and 20 minutes of my life I’m not spending stressing. Leftovers taste just as good the next day—hell, sometimes better, because the flavors meld overnight. Budget-friendly doesn’t get more reliable than this.
Step-by-step instructions for Kraft macaroni and cheese tuna casserole
Let's create this comforting, protein-packed casserole that's perfect for busy weeknights.
Cook the Macaroni and Cheese Base
In a large skillet, melt the 2 tablespoons butter over medium heat. Add the 1 box Kraft Macaroni and Cheese Powder and stir for 1 minute until it begins to bubble and turn golden. Slowly pour in the 2 cups milk while whisking constantly to prevent lumps. Continue cooking for 3-4 minutes until the mixture thickens and becomes creamy.
I like to keep the heat at medium during this step—too high and the cheese can separate, too low and it won't cook through properly. You'll know it's ready when it coats the back of a spoon smoothly. Remove from heat and set aside.
Prepare the Tuna and Pea Mixture
In a medium bowl, gently combine the 2 cans drained flaked tuna in water, 1.5 cups frozen peas (thawed), 1.5 cups shredded cheddar cheese, 0.5 teaspoon garlic powder, 0.5 teaspoon onion powder, 0.25 teaspoon black pepper, and 0.5 teaspoon salt. Mix just until everything is evenly distributed—be careful not to break up the tuna flakes too much.
This is where the magic happens. The tuna stays flaky when handled gently, and the peas release their natural sweetness. I like to use my hands for this step—it's more thorough than a spoon and helps warm the ingredients slightly, which makes them blend better with the macaroni mixture.
Combine and Bake the Casserole
Preheat your oven to 375°F. In a 9x13-inch baking dish, combine the cooked macaroni and cheese mixture with the tuna and pea mixture. Stir well to ensure everything is evenly coated. The casserole should look creamy and inviting with visible tuna flakes throughout.
Spread the mixture evenly in the baking dish—this ensures even cooking. The top should be smooth but slightly uneven from the tuna flakes. Bake uncovered for 20-25 minutes until the edges are golden brown and the center is bubbly. You'll smell that wonderful cheesy aroma filling your kitchen.
Add the Crunchy Topping
While the casserole bakes, prepare the topping by mixing the 0.5 cup breadcrumbs with the 2 tablespoons melted butter. Spread this mixture evenly over the top of the hot casserole just before the 20-minute mark in the oven. The residual heat will help crisp the breadcrumbs beautifully.
Return the casserole to the oven for the remaining 5-10 minutes until the topping is golden brown and crispy. Real talk: this is the moment that matters—don't skip the crispy topping! It adds texture contrast that makes this dish truly special. The casserole is done when the internal temperature reaches 165°F and the topping is golden and crunchy.
Garnish and Serve Warm
Remove the casserole from the oven and let it rest for 5 minutes before serving. This resting time allows the layers to set slightly and makes it easier to serve clean portions. Chop the 2 whole green onions and sprinkle them evenly over the top just before serving.
I know it seems like too much, but trust me—the green onions add a fresh pop of color and brightness that cuts through the richness of the cheesy casserole. Serve immediately while the topping is still crispy and the cheese is melty. This casserole tastes even better the next day, but the texture of the topping is best enjoyed fresh from the oven.
Pro Tips For Making Kraft Macaroni And Cheese Tuna Casserole
- Drain and Rinse the Noodles: The Kraft box says to cook the macaroni until al dente, then drain—stop right there. Give those noodles a quick cold-water rinse after draining. I learned this the hard way: skipping it leaves the casserole gummy, not creamy. The starch clings to the noodles like glue otherwise, and you’ll end up with a sad, sticky mess.
- Squeeze Out Tuna Water: That can of tuna comes packed in water, and if you dump it straight in, your casserole turns into a watery swamp. Grab a paper towel or clean kitchen towel, wrap the drained tuna, and press out as much liquid as you can. Even a little extra moisture makes the texture mushy—trust me, your taste buds will notice the difference.
- Add Cheese in Stages: Don’t just dump all the shredded cheddar at the end like it’s a topping. Mix half of it into the macaroni and cheese sauce while it’s still hot on the stove, then fold in the rest after the tuna and peas go in. The heat melts the cheese better this way, and you avoid clumps that scream “rushed job.” (Yes, even if you’re impatient like me.)
- Toast the Peas First: Frozen peas straight from the freezer? Toss them in a dry skillet over medium heat for 2-3 minutes before adding them to the casserole. They’ll crisp up slightly, adding texture and a subtle sweetness that cuts through the richness. I was skeptical until I tried it—they taste like they belong in the dish, not like an afterthought.
Make-ahead tips for kraft macaroni and cheese tuna casserole
Prep Ahead Strategy
Assemble this casserole completely the night before and refrigerate it uncovered. The cold temperatures help create an extra-crispy top layer when you bake it the next day—no extra effort required.
I’ve made this my go-to for busy mornings: just pop it in the oven while I’m getting ready, and dinner is ready by lunchtime. 💡
Freezer-Friendly Assembly
For meal prep, combine all ingredients (except the breadcrumb topping) in a 9x13-inch baking dish, cover tightly with plastic wrap, then foil. Freeze for up to 3 months. When ready to bake, thaw overnight in the fridge, add the breadcrumb topping, and bake as directed.
The texture stays creamy, though the topping may need an extra 2-3 minutes to crisp.
Oven-Ready Shortcut
Skip the stovetop step entirely by mixing the Kraft macaroni and cheese powder directly with the 2 cups milk in the baking dish. Add the tuna mixture, then bake at 375°F for 30-35 minutes (covered with foil for the first 20 minutes, then uncovered).
This cuts 10 minutes off prep time while keeping the same rich flavor. Perfect for weeknights when you’re short on time!
Double Batch Hack
Make this casserole in a 9x13-inch dish and a 8x8-inch dish simultaneously. The smaller portion is great for leftovers or freezing, while the larger one feeds a crowd. I like to use half-and-half cheddar and mozzarella in the smaller batch for extra meltiness.
Just adjust baking times—cover the smaller dish for 15 minutes first to prevent over-browning.
Reheating Leftovers
Leftovers reheat best in the oven: cover with foil and bake at 350°F for 15-20 minutes until bubbly. For microwave reheating, cover with a damp paper towel and heat in 1-minute intervals on 50% power, stirring between each.
Add a splash of milk to restore creaminess if needed. The breadcrumb topping won’t crisp back up, but the cheesy goodness remains just as comforting. ✨
Make-Ahead Garnish Tip
Pre-chop the green onions and store them separately in an airtight container with a damp paper towel. This keeps them fresh for up to 5 days in the fridge, ready to add a pop of color and freshness whenever you serve.
I also like to pre-measure the breadcrumb topping mix in a small container—just dump and spread when baking day arrives. 🌿
Nutrition facts
Frequently asked questions
Can I use oil-packed tuna instead of water-packed?
The recipe calls for water-packed tuna because it blends more smoothly with the creamy sauce. Oil-packed tuna will work, but you'll need to drain it thoroughly and may want to blot it with a paper towel to remove excess oil first. This prevents the casserole from becoming greasy.
How do I make this dish vegetarian?
Swap the tuna for 1.5 cups of chickpeas (drained and rinsed) or 1 cup of crumbled firm tofu. For extra protein, add 1/2 cup of cooked lentils. Boost the flavor with an extra 1/2 teaspoon garlic powder and 1/4 teaspoon smoked paprika to mimic the tuna's savory depth.
Why does my casserole look dry after baking?
Dry casseroles usually happen from overbaking or insufficient liquid. Make sure to use 2 cups of milk (not skim) and add 1/4 cup extra milk if needed. Cover with foil for the first 20 minutes to trap steam, then uncover for the last 5-10 minutes to crisp the topping. The internal temp should reach 165°F, not higher.
Can I add other vegetables besides peas?
Try 1 cup of corn (fresh or frozen), 1/2 cup of diced carrots, or 1/2 cup of bell peppers. For heartier texture, add 1/2 cup of diced potatoes (parboil first). Just adjust baking time by 5-10 minutes if using denser veggies. The key is to keep the veggie-to-cheese ratio balanced.
How do I make this dish spicier?
Add 1/2 teaspoon of cayenne pepper or 1 teaspoon of hot sauce to the tuna mixture. For smoky heat, stir in 1/2 teaspoon smoked paprika with the spices. If you love kick, sprinkle 1/4 teaspoon of red pepper flakes on top before baking. Pair with a dollop of sour cream to balance the heat.