INGREDIENTS
4 tsps
olive oil
1 medium
onion
1 lb
ground beef
1 serving
salt and pepper
1 pkg
pasta shells
15 ozs
ricotta cheese
3 cups
shredded mozzarella cheese
1 cup
parmesan cheese
2 Tbsps
fresh parsley
2 cloves
garlic
3 cups
marinara sauce
2 Tbsps
butter