INGREDIENTS 16 Ounces Dried Spaghetti Noodles 1 Cup 1 Medium Yellow Onion, Chopped 4 Cloves Garlic Minced 1 1/2 Pounds Sweet Italian Sausage Casing Removed 2--24 Ounce Jars Spaghetti Sauce-Divided 8 Ounces Cottage Cheese or Ricotta Cheese 8 Ounces Cream Cheese 1/4 Cup Sour Cream 3 Teaspoons Dried Italian Seasoning 3 Cups Mozzarella Shredded-Divided Salt Pepper 1/2 Cup Butter Cut Into