Preheat oven to 325°F

Bring four quarts of water to a boil in a large pot over high flame. poor in a generous splash of olive oil and a pinch of salt.

add to spaghetti and cook for about 7 to 10 minutes,until al dente.

while the pasta is cooking, heat a large saucepan over medium flame. and olive oil, then the onion and ground beef. season with salt and pepper, and as garlic salt, and simmer for 6 to 8 minutes.

Pour in marinara sauce in heat, staring so it doesn't stick anywhere, then stir in butter.

Add the cooled pasta to meat sauce long with half a cheese

mix well and pour into pven-safe casserole dish. sprinkle with remaining cheese and bake for 15 minutes