01 -
Get your oven hot at 350°F (175°C). Coat a 9x13-inch baking dish with butter or cooking spray.
02 -
In a big skillet, cook the ground beef with onion until meat turns brown and onions get soft. Pour off any fat, then mix in garlic powder, salt, and pepper.
03 -
Mix the tomato sauce, mushroom soup, and sour cream into your beef mixture. Stir everything together and warm it through.
04 -
Put half your cooked pasta on the bottom of your dish. Cover with half the meat mix, then sprinkle half the cheddar on top. Do the same again with what's left of the pasta, meat, and cheddar.
05 -
Scatter all the mozzarella cheese on the very top.
06 -
Wrap with foil and pop in the oven for 20 minutes. Take the foil off and cook another 10 minutes until the cheese gets bubbly and golden.