01 -
Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish with butter or non-stick cooking spray.
02 -
Bring a large pot of salted water to a boil. Cook macaroni until just al dente, then drain and set aside.
03 -
Return drained macaroni to the pot. Stir in melted Velveeta cheese until evenly combined.
04 -
In a skillet over medium-high heat, cook ground beef with chopped onion until beef is browned and onion is softened. Season with salt and pepper.
05 -
Add sour cream, condensed cheddar cheese soup, onion powder, garlic powder, Parmesan, and milk to the beef mixture. Stir until thoroughly blended.
06 -
Add prepared macaroni with cheese to the beef and cheese sauce mixture. Mix until fully incorporated.
07 -
Evenly spread the complete mixture in the prepared baking dish.
08 -
Layer American cheese slices over the surface, then sprinkle evenly with crushed Ritz cracker crumbs.
09 -
Transfer to preheated oven and bake for 20 to 25 minutes until cheese is melted and the topping is golden brown.
10 -
Allow to rest for several minutes before portioning and serving.