Before You Begin
Preheat and prepare your cookware as needed. Cooking times and results may vary depending on your equipment and ingredients.
Cook the Noodles
Boil noodles in salted water until firm to the bite (al dente). Drain well.
Make the Cream Sauce
Melt butter in a skillet. Whisk in flour and cook 1–2 minutes.
Slowly add milk while whisking to avoid lumps. Simmer until thickened.
Season with salt, pepper, and garlic powder.
Combine Ingredients
Mix noodles, tuna, and peas in a bowl. Pour cream sauce over and stir gently.
Assemble
Spread the mixture into a greased 9×13-inch baking dish.
Add the Topping
Combine cheese, breadcrumbs, and optional melted butter. Sprinkle over casserole.
Bake
Bake at 375°F (190°C) covered for 25 minutes.
Remove foil and bake 10–15 minutes more, until topping is golden.
Rest and Serve
Let rest 5–10 minutes before serving.
Cooking Notes
Servings: This recipe yields about 6 servings, depending on portion size.
Prep time: Allow about 20 minutes to cook noodles and prepare the sauce.
Cook time: The casserole bakes for 35–40 minutes, including uncovered time for browning.
Total time: Plan for 55–60 minutes from start to finish.
Noodle texture: Cook noodles just until firm to the bite, as they continue cooking in the oven.
Sauce consistency: The cream sauce should be thick enough to coat a spoon before combining.
Resting time: Let the casserole rest for 5–10 minutes after baking so it sets before serving.
Equipment note: Cooking times may vary depending on oven performance and dish depth.