Follow these simple, step-by-step instructions to create a delicious and comforting Easy Tuna Casserole that your family will love. This recipe is designed to be straightforward and hassle-free, perfect for busy weeknights or a comforting weekend meal.

1. Preheat Your Oven and Prepare Your Baking Dish: Begin by preheating your oven to 375°F (190°C). This crucial first step ensures that your oven is at the correct temperature when you place the casserole in, allowing for even cooking and a beautifully golden-brown top. While the oven is preheating, lightly grease a 9×13 inch baking dish. Greasing the dish prevents the casserole from sticking and makes serving and cleaning up much easier. You can use cooking spray, butter, or oil to grease the dish.
2. Cook the Egg Noodles: Next, you’ll need to cook the egg noodles according to the package directions. Fill a large pot with salted water and bring it to a rolling boil. Add the egg noodles and cook until they are just tender, or “al dente.” Overcooking the noodles can make them mushy in the casserole, so be sure to follow the package directions closely and check for doneness a minute or two before the recommended time. Once cooked, drain the noodles thoroughly in a colander. Rinsing the noodles is optional; some prefer to rinse to remove excess starch, while others believe the starch helps the sauce adhere better.
3. Prepare the Tuna Mixture: In a large bowl, combine the drained canned tuna, cream of mushroom soup, and milk. Make sure to drain the tuna well to avoid excess liquid in your casserole. Break up the tuna into smaller flakes as you mix it with the soup and milk. Stir everything together until it’s well combined and creamy. At this stage, if you’re using onion powder, add it to the mixture and stir it in for an extra layer of savory flavor. This simple step builds the flavorful base of your casserole.
4. Combine Noodles, Peas, and Cheese: Add the cooked and drained egg noodles and the frozen peas to the tuna mixture. Gently fold everything together until the noodles and peas are evenly coated in the creamy sauce. Make sure to distribute the noodles and peas throughout the mixture so that every bite is balanced. Next, stir in one cup of the shredded cheddar cheese. Reserve the remaining half cup of cheese for the topping. Mixing cheese into the casserole itself adds extra richness and cheesiness to every layer.
5. Transfer to Baking Dish and Top with Breadcrumbs: Pour the tuna noodle mixture into the prepared 9×13 inch baking dish, spreading it evenly. In a small bowl, combine the breadcrumbs and melted butter. If you’re using paprika, sprinkle it over the breadcrumbs at this point. Toss the breadcrumbs and melted butter together until the breadcrumbs are evenly moistened. Sprinkle the buttered breadcrumbs evenly over the top of the casserole. Finally, sprinkle the remaining half cup of shredded cheddar cheese over the breadcrumb topping. This creates a golden, cheesy, and crispy crust that’s irresistible.
6. Bake to Golden Perfection: Place the baking dish in the preheated oven and bake for 20-25 minutes, or until the casserole is heated through, bubbly around the edges, and the breadcrumb topping is golden brown and crispy. Keep an eye on the casserole during the last few minutes of baking to ensure the breadcrumbs don’t burn. The internal temperature of the casserole should reach 165°F (74°C) for food safety, although visually, you’ll know it’s ready when it’s bubbly and golden.
7. Rest and Serve: Once baked, remove the casserole from the oven and let it rest for about 5-10 minutes before serving. This resting time allows the casserole to set slightly, making it easier to serve and preventing it from being too runny. The resting period also helps to distribute the heat evenly throughout the dish. Serve hot and enjoy your delicious and easy tuna casserole!