Prepare spaghetti sauce by using my recipe for Crockpot Spaghetti (or you can use a jar of sauce from the grocery store.)
Cook the beef in a skillet on medium heat until the meat is browned. Drain off excess fat. Place the cooked beef into your crockpot or pot, depending on how you are cooking your sauce. Again, if you are using my Crockpot Spaghetti sauce recipe, refer to that recipe for full list of directions.
Once you have the sauce ready, cook the spaghetti noodles as directed on package.
Preheat broiler to high heat.
Place cooked noodles in a baking dish or individual serving dishes. Cover generously with spaghetti sauce.
Sprinkle a little grated Parmesan cheese over the sauce. Spread a generous amount of shredded mozzarella cheese over sauce.
Place in middle of oven and broil for 1½ minutes.