01 -
Heat a large skillet over medium-high. Add ground beef and chopped onion, cooking until beef is fully browned and onions become translucent. Season generously with salt and black pepper. Drain excess fat.
02 -
Bring a large pot of salted water to a boil. Add macaroni and cook until just al dente, according to package instructions. Drain well and return to the pot.
03 -
Immediately add cubed Velveeta to hot macaroni. Stir until cheese is completely melted and every noodle is well coated.
04 -
In a large bowl or the skillet with beef, mix cheddar cheese soup, sour cream, Parmesan cheese, onion powder, garlic powder, and milk. Stir until smooth and fully combined.
05 -
Fold the cooked beef and onion mixture into the cheesy macaroni in the pot. Add the prepared sauce and toss gently until evenly combined.
06 -
Grease a 9x13-inch baking dish. Spread the macaroni mixture evenly in the dish, smoothing the surface with a spatula.
07 -
Lay American cheese slices evenly over the top. Sprinkle crushed Ritz cracker crumbs across the entire surface for a crispy topping.
08 -
Bake the casserole uncovered in a preheated oven at 350°F for 20–25 minutes, or until the cheese is melted and the cracker topping turns golden brown. Allow to rest 5 minutes before serving.