In a bowl, combine the sour cream and Parmesan cheese. Add pepper, salt, bread crumbs and garlic powder. Crumble meat over mixture and mix well. Shape into 1-inch balls. Place in a greased 15-in.x10-in.x1-in. baking pan. Bake at 350' for 20-25 minutes or until no longer pink.
Transfer meatballs to a slow cooker. Combine the sauce ingredients; pour meatballs. Cover and cook on high for 2 hours or until heated through.