Follow these simple steps to prepare an incredible Tuna Noodle Casserole:

1. Preheat Oven: Set your oven to 350°F (175°C).
2. Cook Noodles: In a large pot, boil water and cook the egg noodles according to package instructions. Drain and set aside.
3. Sauté Vegetables: In a skillet, sauté the chopped onion and celery over medium heat until softened, about 5-7 minutes.
4. Mix Ingredients: In a large mixing bowl, combine the drained tuna, cooked noodles, sautéed vegetables, frozen peas, cream of mushroom soup, milk, garlic powder, salt, and black pepper. Stir until well combined.
5. Transfer to Baking Dish: Spoon the mixture into a greased 9×13 inch baking dish.
6. Add Cheese: Sprinkle shredded cheddar cheese evenly over the top.
7. Top with Chips: If desired, crush potato chips and sprinkle them over the cheese for a crunchy topping.
8. Bake: Place the casserole in the preheated oven and bake for 25-30 minutes or until the dish is heated through and the cheese is bubbly.
9. Cool Slightly: Allow the casserole to rest for a few minutes before serving. This helps it set.

Following these steps will lead you to an amazing Tuna Noodle Casserole that will impress everyone at the table.