Kraft Macaroni and Cheese Tuna Casserole Recipe: Nostalgic One-Pan Dinner

This Kraft Macaroni and Cheese Tuna Casserole brings back the comforting flavors of childhood dinners with minimal effort—just one pan, 30 minutes, and ingredients you already have. The secret lies in balancing creamy macaroni and cheese with flaky tuna, creating a dish that’s nostalgic yet elevated with crispy breadcrumb topping.

Honestly, I’ve made this version dozens of times for busy weeknights, and it never fails to disappear from the table.

The beauty of this recipe is its simplicity: no fancy techniques, just layering cooked macaroni with drained tuna, melted cheese, and a buttery milk mixture before baking until golden. The breadcrumbs on top add that satisfying crunch, while the cheese pulls together into a velvety blanket over the tuna.

It’s the kind of dish that feels indulgent but comes together in under an hour—perfect for feeding a family or meal prepping for the week.

By the time it emerges from the oven, you’ll have a bubbling, cheesy casserole with crispy edges and tender layers beneath. The aroma alone will have everyone gathering around the table, and the first bite delivers that perfect balance of creamy, cheesy, and briny tuna flavors.

This is comfort food at its finest—warm, satisfying, and impossible to resist.

Serve with a simple green salad or steamed vegetables to round out the meal. The leftovers reheat beautifully, making this an ideal recipe for busy schedules. Here’s how to make it—step by step, with all the details you need for success.

Ingredients for kraft macaroni and cheese tuna casserole

Six simple ingredients transform into a nostalgic, cheesy tuna casserole that feeds a crowd.

The Kraft Macaroni and Cheese boxes are the star here—don't skimp on the original flavor kind. I grab mine from Walmart or Target because they're always stocked, but honestly, any grocery store will have them. The tuna? Store-brand in water works just fine—no need for fancy stuff. If you can't find panko, regular breadcrumbs toasted in butter do the trick. The frozen green beans are a lifesaver for busy nights, but fresh work too if you've got 'em. For the cheese, medium cheddar melts best—avoid the pre-shredded stuff with anti-caking agents if you can.

No Kraft boxes? Make your own mac and cheese—just boil elbow macaroni, mix with milk, butter, and shredded cheese until creamy. Out of tuna? Chicken or shrimp works great, but the briny flavor is key here. No panko? Crushed cornflakes add crunch too. The onion and celery are just for flavor—skip 'em if you're in a rush, but they add depth. For the cheese, Colby Jack or American cheese can stand in, but cheddar is the classic. And if you're watching calories, light cheese cuts down the richness without sacrificing too much flavor.

This casserole reheats like a dream—honestly tastes better the next day once everything melds together. Keeps in the fridge for 4-5 days covered, and freezes beautifully for up to 3 months. I always make a double batch because it disappears so fast. For meal prep, portion into 8x8-inch baking dishes so you can reheat just what you need. The breadcrumb topping gets extra crispy after reheating, so don't skip it—it's the best part!

Step-by-step instructions for Kraft macaroni and cheese tuna casserole

Here's how to make this comforting, one-pan dinner that's easier than it looks.

Start by preparing the two boxes of kraft macaroni and cheese powder exactly as directed on the package, using the 2 cups of milk. I like to use a large oven-safe skillet for this—it'll make the next steps easier. Cook the macaroni until it's tender and fully coated in the creamy cheese sauce, then remove from heat.

While the macaroni cooks, dice the 1 whole yellow onion and 2 whole celery stalks into small pieces. You want them finely chopped so they blend seamlessly into the casserole. Set them aside—they'll add great texture and flavor to the dish. Don't skip this step; the veggies make this casserole feel more substantial and balanced.

Once the macaroni is ready, drain any excess water but leave about ½ cup of the starchy cooking liquid—it helps create a creamier sauce. Stir in the drained flakes from the 2 cans of canned tuna in water and the thawed, trimmed 1 cup of frozen green beans. Mix everything together until the tuna and green beans are evenly distributed throughout the macaroni and cheese.

Taste the mixture and adjust seasoning with the 1 tsp of salt and 0.5 tsp of black pepper if needed. This is your chance to make sure the flavors are balanced before baking. The tuna adds protein, while the green beans keep the dish from feeling too heavy. The combination of textures makes each bite interesting.

In a small bowl, mix together the 0.5 cup of all-purpose flour, 0.5 cup of panko breadcrumbs, 0.5 tsp of garlic powder, and a pinch of salt. This forms the crispy topping that makes this casserole so satisfying. Melt the 0.5 cup of unsalted butter in the microwave for about 30 seconds, then stir it into the flour mixture until it forms a crumbly paste.

Spread this mixture evenly over the top of the macaroni and cheese in the skillet. The butter helps create a golden, crispy crust while the panko adds texture. Don't worry if it looks a little messy—it'll all come together in the oven. This topping is what makes this dish feel like a restaurant-quality comfort food.

Sprinkle the 1.5 cups of shredded cheddar cheese evenly over the crumb topping. Place the skillet in a preheated 375°F oven and bake for 25-30 minutes until the top is golden brown and bubbly. You'll know it's ready when the cheese is melted and the crumb topping has turned a beautiful golden color.

Let the casserole rest for 5 minutes after removing from the oven. This resting time allows the cheese to set slightly and makes it easier to serve. The flavors will meld together beautifully during this time, giving you that perfect balance of cheesy, crispy, and creamy textures in every bite.

Use a spatula to carefully transfer the casserole to serving plates. The crispy topping might be tempting to eat first, but resist! The best way to enjoy this dish is to get a bite of everything—the creamy macaroni, the tender green beans, the flaky tuna, and that golden crunchy topping all together.

This casserole tastes even better the next day, so it's perfect for meal prep. The flavors continue to develop as it sits, making it an ideal dish for busy weeknights or family dinners. Serve with a simple side salad or some crusty bread to soak up any extra cheese sauce.

Troubleshooting this dish

Soggy Topping Fix

If your breadcrumb topping turns out soggy instead of crispy, it’s usually because too much moisture escaped during baking. First, preheat your oven for at least 15 minutes to ensure it’s fully hot before adding the casserole.

I also recommend baking on the middle rack—this helps the top dry out faster. For extra insurance, sprinkle an additional ¼ cup panko on top right before baking. This trick works like magic and adds that satisfying crunch you crave. 🌟

Uneven Baking

When the edges cook faster than the center, your casserole ends up with a burnt crust and a cold middle. To prevent this, cover the dish loosely with aluminum foil during the first 15 minutes of baking. This traps heat and helps the center cook through evenly.

I use a 9x13-inch baking dish for this recipe, but if yours is shallower, reduce the oven temperature to 350°F to avoid burning the top. Always check the internal temperature—it should reach 165°F for safety. ⚡

Tuna Too Dry

If your tuna ends up dry and crumbly instead of flaky, it’s likely because you drained it too thoroughly. Leave 1-2 tablespoons of water in each can when draining to keep the flakes moist.

For extra tenderness, rinse the drained tuna under cold water for 10 seconds before mixing it into the macaroni and cheese. This removes excess salt and helps retain moisture. Pro tip: Use wild-caught tuna in water—it’s leaner and holds up better in baking than oil-packed varieties. 🐟

Cheese Not Melting

If your cheese stays in clumps instead of melting smoothly, it’s probably because the oven wasn’t hot enough or the cheese was too cold. Shred your own cheddar (not pre-shredded) for the best results—pre-shredded cheese often contains anti-caking agents that prevent proper melting.

Before baking, microwave the cheese for 20 seconds to take the chill off. Also, stir the macaroni and cheese mixture well before adding the cheese topping to distribute heat evenly. 🧀

Overcooked Macaroni

If your pasta ends up mushy, it’s usually because it sat too long in the starchy cooking liquid. Drain the macaroni immediately after cooking and transfer it to a large bowl. Stir in the tuna and green beans right away, then assemble the casserole.

For extra insurance, undercook the pasta by 1 minute—it’ll finish cooking in the oven. If you’re prepping ahead, store the unassembled layers in the fridge for up to 24 hours before baking to prevent sogginess. ⏱️

Weak Flavor Profile

If your casserole tastes bland, it’s likely because the seasoning wasn’t balanced. Boost the flavor by adding ½ teaspoon of mustard powder or 1 teaspoon of lemon juice to the macaroni and cheese mixture—this brightens up the tuna.

For extra depth, sauté the diced onion and celery in 1 tablespoon of butter for 3 minutes before mixing them into the casserole. This caramelization adds a whole new layer of taste.

Don’t forget to taste and adjust seasoning before baking—sometimes a pinch of smoked paprika or Worcestershire sauce can elevate the dish. 💡

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