01 -
In a skillet over medium-high heat, cook ground beef and chopped onions until beef is browned and cooked through and onions are tender and translucent. Season with salt and pepper.
02 -
Boil macaroni in salted water until just al dente, then drain thoroughly to avoid mushiness.
03 -
Return warm drained macaroni to pot and stir in melted Velveeta cheese until noodles are coated evenly and creamy.
04 -
In a bowl or skillet with beef mixture, combine sour cream, cheddar cheese soup, onion powder, garlic powder, grated Parmesan, and milk. Stir until smooth and well mixed.
05 -
Fold cheesy macaroni into the sauce and beef mixture gently until fully combined.
06 -
Grease a 9x13 inch baking dish. Spread the combined mixture evenly in the dish to create a flat surface.
07 -
Layer American cheese slices evenly over the casserole mixture, then sprinkle crushed Ritz cracker crumbs on top to form a crunchy crust.
08 -
Bake uncovered in a preheated 350°F oven for 20 to 25 minutes until cheese melts and cracker topping is golden brown. Let stand for a few minutes before serving.