Layer the Ingredients: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish. Start by spreading half of the beef mixture in an even layer on the bottom of the baking dish. Then, layer the creamy noodle mixture on top. Finally, add the remaining beef mixture on top of the noodles.
Add the Cheese Topping: Sprinkle the shredded cheddar cheese and mozzarella cheese evenly over the top of the casserole. This will create a gooey, melted layer of cheesy goodness as it bakes.
Step 4: Bake the Casserole
Bake: Cover the baking dish with foil and bake in the preheated oven for 20 minutes. Then, remove the foil and bake for an additional 10-15 minutes, or until the cheese on top is melted and bubbly, with golden-brown edges.
Rest and Serve: Allow the casserole to rest for 5-10 minutes before serving. This helps the layers set and makes it easier to serve.
