This tuna mornay pasta bake is the kind of dinner that feeds a hungry table with one pot, one baking dish, and ingredients from the pantry. Tender penne, flaked tuna, and sweet corn sit in a silky cheese sauce, and a layer of buttery panko turns crisp and golden in the oven.
Mornay is simply a white sauce finished with cheese, and it is easier than most people expect. You whisk butter, flour, and milk until thick, stir in Parmesan off the heat, and fold in the pasta. This version is a classic Australian family dinner, and it works just as well on a busy weeknight as it does when you are cooking for a crowd.
Table of Contents
Why This Tuna Mornay Pasta Bake Recipe Works
The sauce is smooth because the flour cooks in butter and garlic first, then the milk goes in slowly. Adding the first third of the milk to make a thick paste, then whisking in the rest, keeps the sauce free of lumps. A little mustard powder, onion powder, and garlic powder give the sauce depth without any extra work.
The pasta is cooked for one minute less than the package says. It finishes softening in the oven while it absorbs some of the sauce, so the bake never turns mushy. Tuna packed in oil adds richness and keeps the flakes moist, and sweet corn brings a little pop of sweetness against the savory cheese.
The topping matters too. Panko tossed with melted butter and a handful of grated Parmesan browns fast and stays crunchy on top of the creamy filling. Every spoonful gets a bit of crunch, a bit of cheese sauce, and a chunk of tuna, which is exactly what you want from a casserole.
Ingredients for Tuna Mornay Pasta Bake
- 12 oz penne pasta, or any short pasta
- 15 oz canned tuna in oil, drained
- 14 oz canned corn, drained
- 3 tbsp butter, for the sauce
- 3 cloves garlic, finely minced
- 4 tbsp all purpose flour
- 4 cups milk, any fat level
- 1 tsp chicken bouillon powder
- 1/2 cup finely shredded Parmesan, for the sauce
- 1/2 tsp each mustard powder, onion powder, and garlic powder
- 1/2 cup panko breadcrumbs, for the topping
- 1/4 cup finely grated Parmesan, for the topping
- 1 1/2 tbsp butter, melted, for the topping
- Chopped chives or parsley, for garnish
Penne. Short tubes hold the sauce inside and out. Rigatoni, shells, or macaroni work well too.
Tuna in oil. Oil packed tuna stays softer and richer than tuna packed in water. Drain it well and flake it into large chunks so it does not disappear into the sauce.
Milk. Any milk works, from whole to low fat to a plant based option. Warm milk blends in a little faster, but cold milk is fine if you whisk steadily.
Parmesan. Fine shreds melt into the sauce quickly. Stir them in off the heat so the sauce stays smooth and does not turn grainy.
Panko. These light breadcrumbs stay crisp far longer than regular crumbs, which is why they are the ideal choice for the topping.
How to Make Tuna Mornay Pasta Bake
1. Prepare the oven and topping Heat the oven to 350 degrees F. Stir the melted butter, panko, and grated Parmesan together in a small bowl and set it aside. Lightly grease a 9×13 baking dish.
2. Cook the pasta Boil the penne in salted water for one minute less than the package directions, usually 8 to 9 minutes. Drain it well and let it sit in the colander while you make the sauce.
3. Start the sauce Melt 3 tablespoons butter in a large pot over medium heat. Add the garlic and stir for 30 seconds until fragrant, then whisk in the flour and cook for one minute so the raw flour taste disappears.
4. Whisk in the milk Pour in one third of the milk and whisk to a thick paste, then add the rest in two more additions. Stir in the bouillon powder, mustard powder, onion powder, and garlic powder. Simmer for 4 to 5 minutes, whisking often, until the sauce coats the back of a spoon.
5. Finish with cheese Take the pot off the heat and stir in the shredded Parmesan until melted and smooth.
6. Combine the filling Tip the pasta into the pot, add the tuna in large flakes, and add the drained corn. Fold gently so the tuna keeps its texture and the sauce coats every piece.
7. Top and bake Scrape everything into the baking dish, spread it level, and scatter the panko topping over the surface. Bake for 25 minutes, until the edges bubble and the top is deep golden. Rest for 5 minutes, then sprinkle with chives.
How to Serve Tuna Mornay Pasta Bake
Serve the bake straight from the dish with a crisp green salad or a pile of steamed green beans to balance the creamy sauce. A simple Italian house salad is a great match, and garlic bread slices help mop up every drop of sauce. For a bigger spread, add fluffy dinner rolls, and finish the meal with a glass of strawberry pineapple mojito for the adults.
How to Store and Reheat Tuna Mornay Pasta Bake
Cool leftovers within 2 hours, then store in an airtight container in the refrigerator for up to 3 days. Because the sauce is milk based, freezing is not recommended, since it can turn grainy when thawed. Reheat single portions in the microwave until steaming hot, stirring halfway, or cover the dish with foil and warm it in a hot oven at 350 degrees F. The leftovers should reach 165 degrees F in the center.
Tips and Variations for Tuna Mornay Pasta Bake
Do not overcook the pasta. Pulling it one minute early is the secret to a bake that is creamy rather than soft.
Flake the tuna by hand. Large flakes give you real bites of fish in the casserole instead of a uniform paste.
Warm the milk. If you have a few minutes, warm the milk in the microwave first so the sauce thickens even faster.
Swap the fish. Canned salmon works in the same amounts, and it is a good choice if you want more omega 3 fats.
Add vegetables. Fold in a cup of thawed peas, sauteed onion, or chopped bell pepper for extra color.
Try a cheese blend. Replace half the Parmesan with sharp cheddar for a richer, more rounded sauce.
Make it ahead. Assemble the dish up to a day in advance and keep it covered in the refrigerator. Add 5 to 10 minutes to the baking time since it starts cold.
Handle food safely. Keep leftovers cold and reheat them thoroughly, following the FDA safe food handling guidance for cooling and reheating casseroles.
Frequently Asked Questions About Tuna Mornay Pasta Bake
Can I make this tuna mornay pasta bake ahead of time?
Yes. Assemble it up to a day ahead, cover it, and keep it in the refrigerator. Add the panko topping just before baking and allow a few extra minutes in the oven.
What goes with tuna mornay pasta bake for dinner?
A green salad, steamed broccoli, or green beans pair well with the creamy sauce, and garlic bread rounds out the meal.
Can I freeze tuna mornay pasta bake?
It is ideal not to. Milk based sauces tend to separate and turn grainy after freezing, so plan to enjoy the leftovers within 3 days.
What can I use instead of penne?
Any short pasta works, including rigatoni, shells, fusilli, or elbow macaroni. Adjust the boiling time to match the package.
Can I use tuna packed in water?
Yes, drain it very well. The sauce will taste a little lighter, so add a pinch more garlic powder if you like.
Tuna Mornay Pasta Bake with Crunchy Panko Topping
Equipment
- Large pot
- Whisk
- 9×13 inch baking dish
- Colander
Ingredients
Main Ingredients
- 12 oz penne pasta or any short pasta
- 15 oz canned tuna in oil drained and flaked
- 14 oz canned corn drained
- 3 tbsp butter for the sauce
- 3 cloves garlic finely minced
- 4 tbsp all purpose flour
- 4 cup milk any fat level
- 1 tsp chicken bouillon powder
- ½ cup finely shredded Parmesan for the sauce
- ½ tsp mustard powder
- ½ tsp onion powder
- ½ tsp garlic powder
- ½ cup panko breadcrumbs for the topping
- ¼ cup finely grated Parmesan for the topping
- 1 ½ tbsp butter melted, for the topping
- 1 tbsp chopped chives or parsley optional, for garnish
Instructions
Cooking
- Prep. Heat the oven to 350 degrees F. Mix the melted butter, panko, and 1/4 cup Parmesan for the topping.
- Boil pasta. Cook the penne 1 minute short of the package time, then drain.
- Build the sauce. Melt 3 tbsp butter, stir in the garlic for 30 seconds, then the flour for 1 minute. Whisk in the milk in three additions with the bouillon and powders, and simmer 4 to 5 minutes until thick.
- Add cheese. Off the heat, stir in 1/2 cup Parmesan until smooth.
- Combine. Fold the pasta, flaked tuna, and corn into the sauce.
- Bake. Spread in a 9×13 dish, add the topping, and bake 25 minutes until golden and bubbling. Rest 5 minutes.
