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 black pepper to taste.
02 -
Boil elbow macaroni in salted water until just al dente, approximately 7 to 8 minutes. Drain thoroughly and return to the pot.
03 -
Stir the melted Velveeta cheese into the warm macaroni until the mixture is evenly coated and creamy.
04 -
In the skillet or a separate bowl, blend sour cream, cheddar cheese soup, onion powder, garlic powder, grated Parmesan cheese, and whole milk until smooth and uniform.
05 -
Gently fold the cheesy macaroni and browned ground beef into the prepared sauce until fully combined.
06 -
Grease a 9×13 inch baking dish and spread the mixture evenly to create a level surface.
07 -
Layer American cheese slices evenly over the casserole, then 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.