01 -
In a skillet over medium-high heat, cook ground beef with chopped onions until beef is browned and onions are tender and translucent. Season with salt and pepper.
02 -
Boil macaroni in salted water until just al dente, about 7 to 8 minutes. Drain thoroughly and return to pot.
03 -
Stir melted Velveeta cheese into warm macaroni until evenly coated and creamy.
04 -
In the skillet or separate bowl, combine sour cream, cheddar cheese soup, onion powder, garlic powder, grated Parmesan, and milk. Mix until smooth and uniform.
05 -
Fold the cheesy macaroni and browned beef mixture into the sauce gently until fully combined.
06 -
Grease a 9x13 inch baking dish. Spread mixture evenly in the dish creating a level surface.
07 -
Layer American cheese slices over the casserole then evenly sprinkle crushed Ritz cracker crumbs on top.
08 -
Bake uncovered in a preheated oven at 350°F (177°C) for 20 to 25 minutes until the top is golden brown and bubbly. Allow to rest briefly before serving.