01 -
Preheat the oven to 175°C (350°F). Lightly grease a 9x13 inch baking dish.
02 -
Bring a large pot of salted water to a boil. Cook the macaroni until al dente according to package instructions. Drain well.
03 -
Return the drained macaroni to the pot. Add the Velveeta cheese and stir over low heat until completely melted and well combined.
04 -
In a large skillet over medium-high heat, cook the ground beef and chopped onion until the beef is thoroughly browned and the onion has softened, about 5-7 minutes. Season with salt and pepper to taste.
05 -
Add the sour cream, cheddar cheese soup, onion powder, garlic powder, Parmesan cheese, and milk to the skillet with the beef mixture. Stir until well combined and heated through.
06 -
Add the cheesy macaroni to the skillet with the meat mixture and stir to thoroughly combine. Transfer the entire mixture to the prepared baking dish, spreading it evenly.
07 -
Arrange the American cheese slices over the top of the casserole. Sprinkle evenly with the crushed Ritz cracker crumbs.
08 -
Bake in the preheated oven for 20-25 minutes until the topping is golden brown and the casserole is bubbling around the edges.
09 -
Remove from the oven and let stand for 5 minutes before serving to allow the casserole to set slightly.