Preheat the oven to 375°F.

In a baking dish, whisk together the cream of mushroom soup, French onion soup, sour cream, mayonnaise, garlic powder, salt, and black pepper until smooth.

Add the egg noodles and ground beef and fold with a rubber spatula until well combined.

Sprinkle top of casserole with the french-fried onions.

Bake the casserole on middle rack of oven until it is bubbling and heated through, 20-25 minutes.

Check to see that casserole is done. Remove from oven or add time as needed.

Allow the casserole to cool for 5-10 minutes before serving.