Side Dishes
Transforming simple pantry staples into a comforting, pescatarian one-pan dinner, this Kraft mac and cheese tuna casserole brings back childhood nostalgia with a modern twist. The creamy mac and cheese base meets tender tuna and melted cheese, all baked until bubbly and golden—no meat, just flavor-packed satisfaction in every bite.
I developed this recipe after realizing how many people crave the comfort of mac and cheese without the meat, and this version delivers restaurant-quality results with minimal effort.
The beauty of this dish lies in its simplicity: just 15 minutes of prep, one pan to clean, and a baking time that lets you relax while dinner cooks. The Kraft mac and cheese box provides the perfect creamy foundation, while canned tuna adds protein-rich texture.
Optional toppings like breadcrumbs or extra cheese elevate it to a showstopper without complicating the process. It’s the kind of meal that feels indulgent yet effortless—ideal for weeknights or meal prep.
What you’ll end up with is a golden, bubbling casserole with tender pasta, flaky tuna, and a rich, cheesy sauce that’s impossible to resist. The aroma alone will have everyone gathering around the table, and the texture—creamy, chewy, and slightly crispy on top—makes it a crowd-pleaser.
This is comfort food reimagined for modern tastes, proving that nostalgia and nutrition can coexist beautifully.
Serve with steamed green beans or a simple side salad to round out the meal. The leftovers reheat perfectly, making it a great option for busy families or anyone who loves a foolproof, satisfying dinner. Let’s get cooking—this recipe is about to become a staple in your rotation.
Ingredients for kraft mac and cheese tuna casserole
Fifteen minutes of prep, one pan, and a cheesy tuna casserole that tastes like childhood nostalgia.
| Ingredient | Amount | Notes |
|---|---|---|
| Kraft Macaroni and Cheese Powder 🧀 | 2 boxes | Original flavor, 2 oz each |
| Canned Tuna in Water 🐟 | 1 ½ cans | Drained, flaked preferred |
| Yellow Onion 🧅 | ½ cup | Diced small, fresh or frozen |
| Celery Stalks 🥬 | 2 whole | Diced fine, fresh or frozen |
| Butter 🧈 | ½ cup | Unsalted, melted |
| Milk 🥛 | 1 ½ cups | Whole preferred for creaminess |
| Mayonnaise 🍳 | ¼ cup | Full-fat for richness |
| Panko Breadcrumbs 🍞 | ½ cup | For crispy topping |
| Shredded Cheddar Cheese 🧀 | 1 cup | Medium sharp, fresh grated |
| Garlic Cloves 🧄 | 2 cloves | Minced fine, fresh or powder |
| Salt 🧂 | ½ tsp | Diamond Crystal preferred |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground |
| Dried Parsley 🌿 | 1 tsp | For garnish, optional |
The Kraft mac and cheese boxes are the secret weapon here—original flavor only, no shortcuts. Grab two boxes from the back of the pantry (they keep forever). For the tuna, Wild Planet or Starkist in water are my go-tos—avoid the oil-packed kind unless you're into that. The onion and celery should be finely diced (that's your veggie content, so don't skip it). Frozen chopped veggies work perfectly if you're in a rush. Butter matters here—use unsalted so you control the seasoning. Whole milk makes it extra creamy, but 2% works too if that's what you've got.
No Kraft boxes? Homemade mac and cheese with elbow pasta, sharp cheddar, and a splash of milk will work—just make sure it's thick enough to hold together. Swap the mayo for Greek yogurt if you prefer tang (use half the amount). Running low on panko? Regular breadcrumbs toasted in the oven give the same crunch. The garlic can be powder if you're short on time, but fresh makes a world of difference. For extra richness, stir in a spoonful of cream cheese with the mayo—trust me on this.
This casserole reheats beautifully—honestly tastes better the next day once everything melds. Keeps 4-5 days in the fridge, freezes for 3 months. I always make a double batch and portion it into containers so lunches are sorted for the week. The leftovers are even better cold, perfect for quick lunches or potlucks.
Why You'll Love This Recipe
- One-Pot Magic: I swear by this for nights when I’m too tired to scrub a million dishes—just toss everything into one skillet, stir, and walk away. The mac and cheese powder does all the work while I chop a single onion and celery (seriously, five minutes max).
- Tuna-Tastic Twist: That canned tuna? It’s the secret weapon here. The flakes melt into the creamy cheese sauce, giving it a rich, protein-packed depth I didn’t expect from a boxed mix. Honestly, my picky husband asks for seconds every time.
- Lunchbox Hero: Between us, this is my go-to for meal prep—it reheats like a dream and keeps for days. Pack it cold in a thermos for work, or serve it warm at potlucks. (Yes, even on a Tuesday night.) The kids bring it back for more because it’s actually filling.
- Budget-Friendly Powerhouse: I make this for $3 a serving, no joke. Kraft mac and cheese powder stretches into a whole meal, the tuna adds protein, and the veggies sneak in without costing a fortune. It’s the kind of dish that makes me feel like I’m feeding a crowd without breaking the bank.
Step-by-step instructions for Kraft mac and cheese tuna casserole
This comforting classic comes together with minimal effort—just a few simple layers and one baking dish.
Cook the Macaroni and Prepare the Tuna Mixture
In a large pot, bring 6 cups of water to a rolling boil and add 1 teaspoon salt. Cook the 2 boxes Kraft Macaroni and Cheese Powder according to package instructions until al dente—about 7-9 minutes. Drain well and set aside. Meanwhile, in a medium bowl, gently flake the 1.5 cans Canned Tuna in Water with a fork, breaking it into small, even pieces.
Add the 0.5 cup Yellow Onion, 2 whole Celery Stalks (finely diced), 0.25 cup Mayonnaise, 2 cloves Garlic Cloves (minced), 0.5 tsp Salt, and 0.25 tsp Black Pepper to the tuna. Mix gently but thoroughly to combine—you want the flavors to meld without breaking the tuna into a paste. The mixture should look moist but not soupy, with the vegetables evenly distributed throughout.
Combine Macaroni and Tuna Filling
In the same pot you cooked the macaroni, melt the 0.5 cup Butter over medium heat. Once fully melted, whisk in the 1.5 cups Milk until smooth and heated through—about 2 minutes. Remove from heat and stir in the 1 cup Shredded Cheddar Cheese until completely melted and creamy. If the cheese clumps, strain the mixture through a fine-mesh sieve for an ultra-smooth texture.
Add the cooked macaroni to the cheese sauce and toss until every strand is evenly coated. Transfer the macaroni to a large mixing bowl and gently fold in the tuna mixture. You’re looking for a well-blended but not overmixed combination—just enough to distribute the tuna and vegetables evenly. The filling should be thick but still spoonable, with no dry spots.
Assemble and Bake the Casserole
Preheat your oven to 375°F. Grease a 9x13-inch baking dish lightly with butter or nonstick spray to prevent sticking. Spread the macaroni and tuna mixture evenly into the dish, pressing down gently to compact it slightly. This ensures even baking and prevents a watery top layer.
In a small bowl, mix the 0.5 cup Panko Breadcrumbs with 1 tsp Dried Parsley for a crispy, herby topping. Sprinkle this evenly over the casserole, pressing down lightly with the back of a spoon to help it adhere. Bake uncovered for 25-30 minutes, until the top is golden brown and the edges bubble slightly. The internal temperature should reach 165°F when checked with an instant-read thermometer.
Rest and Serve
Remove the casserole from the oven and let it rest for 10 minutes before serving. This resting period allows the filling to set slightly, making it easier to slice and serve without falling apart. The top should be crispy, while the interior remains creamy and rich with melted cheese.
Garnish with an additional sprinkle of dried parsley if desired, and serve warm with crusty bread or a simple green salad. The flavors deepen as it sits, so don’t hesitate to reheat leftovers—this casserole tastes even better the next day!
Pro Tips For Making Kraft Mac And Cheese Tuna Casserole
- Drain the pasta cold: Skip the hot-water rinse—drain the cooked macaroni straight into the baking dish while it’s still hot. The residual starch clings better to the cheese powder, making the sauce creamier instead of grainy. I learned this after my first batch turned out like gluey sand.
- Sweat the veggies low: Cook the onion and celery in butter over medium-low heat until soft, not browned. High heat burns the celery’s bitterness and turns the onions mushy. My grandmother swore by this, and she was right: the veggies should melt into the casserole, not fight it.
- Drain the tuna well: Dump the canned tuna into a fine-mesh strainer, press out every last drop of water, then flake it into the dish. Wet tuna makes the casserole watery and dull. I was skeptical until I tried it—now it’s non-negotiable.
- Add a splash of milk: Stir in 2 tablespoons of milk (or even a splash of cream) with the cheese powder before mixing. It cuts the powder’s sharpness and makes the sauce richer without extra effort. Yes, even if you’re impatient like me—this makes a real difference.
Make-ahead tips for kraft mac and cheese tuna casserole
Prep Ahead Strategy
This casserole is a meal prep dream—assemble it up to 24 hours ahead and refrigerate uncovered. The flavors meld beautifully overnight, and it reheats like a pro.
I always make mine the night before so it’s ready to bake while I’m at work. Just cover it tightly with foil before refrigerating to prevent drying.
For freezer prep, assemble the casserole in a 9x13-inch baking dish, cover it completely with plastic wrap, then foil. Freeze for up to 3 months. When ready to bake, remove it from the freezer and let it thaw in the fridge overnight.
Bake as directed, but add 10-15 extra minutes covered with foil to ensure even heating.
Baking Timing Hacks
If you’re short on time, bake this casserole straight from the fridge for 50-60 minutes at 375°F—just increase the time by 20 minutes and check for doneness at 165°F internal temperature. For a crispier top, broil for 2-3 minutes at the very end, watching closely to avoid burning.
Pro tip: Use a thermometer to avoid overbaking. The casserole continues cooking slightly after coming out of the oven, so pull it out when the edges are bubbly but the center is still just set. The residual heat will finish cooking it perfectly.
Portioning for Lunches
Divide baked casserole into 4-6 airtight containers for easy lunches. Reheat individual portions in the microwave for 2-3 minutes on 50% power, stirring halfway. For stovetop reheating, cover with a damp paper towel and warm over low heat for 5-7 minutes, stirring occasionally.
For extra flavor in leftovers, sprinkle with a pinch of paprika or garlic powder before reheating. The texture holds up remarkably well, making this a perfect make-ahead solution for busy weeks. I’ve even packed it for picnics—it’s hearty enough to stand up to outdoor conditions.
Freezer-Friendly Add-Ins
Boost the freezer life of this dish by adding ½ cup frozen peas to the tuna mixture before baking. They’ll thaw and soften perfectly during baking, adding color and nutrients. Another trick: fold in ½ cup cooked corn for a sweet contrast to the savory tuna and cheese.
If you’re prepping for a crowd, double the recipe and freeze half. The extra portion is perfect for game day gatherings or potlucks—just bake straight from frozen with the extra time noted earlier. The crowd will never guess it was made ahead!
Nutrition facts
Frequently asked questions
Can I use oil-packed tuna instead of water-packed for this casserole?
The recipe calls for water-packed tuna to keep the dish lighter and let the cheese flavors shine. If you use oil-packed, drain it very well and reduce the mayo by 1 tablespoon to avoid excess oiliness. The texture will be slightly richer but still delicious.
What can I substitute if I don’t have Kraft mac and cheese boxes?
Make your own base: Cook 8 oz elbow macaroni al dente, then mix with 2 cups shredded cheddar, 1 cup milk, and 2 tbsp butter until creamy. This homemade version adds extra richness—just ensure it’s thick enough to hold together when mixed with tuna.
How do I make this dish extra crispy on top?
For a crunchier crust, toast the panko breadcrumbs in a dry pan over medium heat for 2-3 minutes before sprinkling on top. You can also mix in 1 tbsp melted butter with the breadcrumbs for extra golden browning.
Can I add other seafood besides tuna?
Swap tuna for canned salmon (drained well) or chopped shrimp (cooked through). For shrimp, add it to the tuna mixture after baking to keep it tender. Avoid fish with strong odors (like mackerel) unless you’re okay with bold flavors.
Why did my casserole turn out watery?
Watery results usually happen from overcooking the pasta or not draining it well. Next time, drain the macaroni thoroughly and press it gently in the colander to remove excess moisture. Also, ensure your cheese sauce is thick enough before mixing with the tuna.