01 -
Preheat the oven to 350°F. Grease a 9x13 inch baking dish with butter or non-stick spray.
02 -
Boil macaroni noodles in salted water until al dente. Drain and return to the pot; stir in melted Velveeta cheese until fully combined.
03 -
In a skillet over medium-high heat, brown ground beef with chopped onion until beef is cooked through and onion is softened. Season with salt and pepper.
04 -
Stir sour cream, cheddar cheese soup, onion powder, garlic powder, Parmesan cheese, and milk into the beef mixture until well blended. Add macaroni and mix thoroughly.
05 -
Spread the combined mixture evenly into the prepared baking dish.
06 -
Top the casserole with American cheese slices; sprinkle crushed Ritz cracker crumbs evenly over the surface.
07 -
Bake in the preheated oven for 20-25 minutes until cheese melts and topping is golden brown. Let rest a few minutes before serving.