This tuna pasta bake casserole is a one-dish dinner made with canned tuna, short pasta, sweet corn, and a creamy cheddar sauce.
This casserole works on a busy weeknight, holds up well for meal prep, and feeds four people with almost no effort.
I always drain the tuna really well before mixing it in; any liquid left in the can thins the sauce and you end up with a watery bake instead of a creamy one.
If you like easy pasta casseroles, check out more quick dinner recipes on the site.
Why You Will Love This Recipe
- — One dish, minimal cleanup — everything bakes in a single dish and the sauce mixes in one bowl.
- — Built from pantry staples — canned tuna, sweet corn, and a tin of soup are things most kitchens already have.
- — Ready in under 45 minutes — including full oven time, this is a genuinely fast dinner.
- — Great for meal prep — it keeps well in the fridge for 3 days and reheats without losing texture.
- — Kid-friendly — mild flavors, melted cheese on top, and nothing that needs explaining at the table.
What Goes Into Tuna Pasta Bake Casserole with Sweet Corn
The Tuna
Use canned tuna in brine or spring water, not oil. Oil-packed tuna makes the sauce greasy and can cause it to split when you mix it with the soup base. Drain it thoroughly — press the lid against the can before opening fully to squeeze out as much liquid as possible. Two 160g cans gives the right amount of protein without overwhelming the pasta.
The Pasta
Short shapes work best — penne, rigatoni, bow tie or fusilli all hold the creamy sauce well and give you something substantial to fork into.
Cook the pasta to just under al dente before mixing, because it continues cooking in the oven. If it goes in fully cooked, it’ll be soft and loose by the time the casserole is done.
Sweet Corn
Canned sweet corn is the easiest option here — just drain it before adding. Frozen corn works too if you thaw it first and pat it dry. The corn adds mild sweetness that cuts through the richness of the cheese sauce and gives each bite a little bit of texture contrast.
The Sauce
Cream of mushroom soup is the base — it adds savory depth and saves you from making a roux. Mix it with sour cream and grated cheddar for a sauce that coats the pasta without being heavy.
Grate your own cheddar from a block rather than using the pre-shredded kind — it melts cleanly and gives you a smooth sauce rather than a gritty one.
The Topping
More grated cheddar goes on top, plus breadcrumbs if you want a crunchy finish. The breadcrumbs toast up in the oven and give the surface that slightly crispy layer that makes the whole thing feel complete. If you’re skipping the crunch, just extra cheese on top is fine.
How to Make Tuna Pasta Bake Casserole with Sweet Corn
Step 1 — Cook the Pasta
Bring a large pot of well-salted water to a boil and cook the pasta for 2 minutes less than the package instructions say.
You want it firm in the center — underdone is exactly right here because it will finish in the oven. Drain and rinse briefly under cold water to stop the cooking and keep the pieces from clumping together while you put the rest of the dish together.
Step 2 — Build the Sauce
In a large mixing bowl, combine the cream of mushroom soup, sour cream, and about two-thirds of the grated cheddar. Stir until smooth. Season with black pepper and just a small pinch of salt — both the soup and the tuna carry salt already, so go light. Add the drained tuna and fold it in gently, keeping it in chunks rather than breaking it all the way down.
Step 3 — Fold in Pasta and Corn
Add the drained pasta and sweet corn to the bowl and fold everything together until the pasta is evenly coated in sauce. The mixture should look thick and creamy — not soupy, not stiff. If it’s too thick to fold easily, add a splash of milk and fold again. Don’t overmix once the tuna is in — you want it in pieces, not worked into the sauce.
Step 4 — Assemble the Casserole
Lightly grease a 9×13 inch baking dish and transfer the pasta mixture in. Spread it into an even layer. Scatter the remaining cheddar over the top, then add the breadcrumbs in an even layer.
Press the breadcrumbs down gently so they sit against the cheese rather than sitting loose on top — they brown better that way and stick when you serve.
Step 5 — Bake Until Golden
Bake at 200°C (400°F) for 20–25 minutes, until the top is golden brown and the edges are clearly bubbling. If the top starts browning too fast before the center heats through, cover loosely with foil for the first 15 minutes and remove it for the last 5–10. Let the casserole sit for 5 minutes after it comes out — the sauce firms up slightly and it holds together much better when you serve it.
Tips for the Best Tuna Pasta Bake Casserole with Sweet Corn
Drain everything well.
Tuna and corn both carry liquid. Skip proper draining and the sauce thins out, giving you a watery bake instead of a creamy one.
Undercook the pasta going in.
Two minutes under al dente is the rule — the oven finishes the job. Fully cooked pasta goes soft and mushy by the time the casserole is done.
Grate the cheese yourself.
Pre-shredded cheese has anti-caking agents that stop it melting cleanly. A block grated at home gives you a much smoother sauce and better browning on top.
Let it rest before serving.
Five minutes out of the oven is enough for the sauce to firm up so you can scoop it cleanly rather than it running all over the plate.
How to Serve Tuna Pasta Bake Casserole with Sweet Corn
This is a scoop-straight-from-the-dish kind of meal. Serve it hot at the table on a weeknight, or keep it warm in a low oven if you’re feeding people in stages. No garnish needed, though a little fresh parsley on top adds some color if you want it.
- Simple green salad with lemon vinaigrette
- Steamed broccoli or green beans on the side
- Garlic bread to scoop up the extra sauce
- Coleslaw for crunch and freshness
- Cold sparkling water or a light white wine
How to Store & Customize Tuna Pasta Bake Casserole with Sweet Corn
Storage — Leftovers keep in an airtight container in the fridge for up to 3 days. Keep it in the baking dish if you’re reheating the whole thing at once; otherwise transfer individual portions to a sealed container.
Reheating — Cover with foil and reheat in the oven at 180°C (350°F) for 15–20 minutes. For single portions, 2–3 minutes in the microwave works well — add a small splash of milk before covering and heating to keep the sauce from drying out.
Freezing — This bake freezes well. Cool it completely, portion into airtight containers, and freeze for up to 2 months. Thaw overnight in the fridge, then reheat covered in the oven at 180°C until piping hot throughout.
Variations & swaps — Swap the tuna for canned salmon if that’s what you have; it works exactly the same way with a slightly richer flavor. Use frozen mixed vegetables instead of corn if you want more variety — peas, carrots, and green beans all hold up well. Add a teaspoon of chili flakes to the sauce if you want a mild kick. For a gluten-free version, use gluten-free pasta and swap the breadcrumbs for a gluten-free alternative.
Tuna Pasta Bake Casserole with Sweet Corn
Ingredients
For the Casserole
- 300 g penne or bow tie pasta
- 2 cans (160g each) tuna in brine well drained
- 1 can (200g) sweet corn drained
- 1 can (295g) cream of mushroom soup
- 3 tablespoons sour cream
- 150 g cheddar cheese grated, divided
- salt and black pepper to taste
For the Topping
- 50 g breadcrumbs
- 50 g extra cheddar cheese grated
Instructions
- Preheat oven to 200°C (400°F). Cook pasta in well-salted boiling water for 2 minutes less than package instructions. Drain and cool briefly.
- In a large bowl, mix cream of mushroom soup, sour cream, and two-thirds of the cheddar. Season with black pepper. Add drained tuna and fold in gently, keeping chunks intact.
- Add the drained pasta and sweet corn and fold until evenly coated. Add a splash of milk if the mixture looks too thick.
- Transfer to a greased 9×13 inch baking dish. Top with remaining cheddar and breadcrumbs, pressing lightly to help them stick.
- Bake for 20–25 minutes until the top is golden brown and edges are bubbling. Rest for 5 minutes before serving.
Notes
- Drain tuna and corn thoroughly — excess liquid makes the sauce watery.
- Cook pasta 2 minutes under al dente; it finishes cooking in the oven.
- Grate cheese from a block for a smoother, cleaner melt.
- Add a splash of milk before reheating leftovers to keep the sauce creamy.
- Freeze in airtight portions for up to 2 months.
