Crock-pot Ravioli Casserole

Ingredients

• 1� lbs. lean ground beef
• 1 onion, chopped
• 1 clove garlic, minced
• 1 (15 oz.) can tomato sauce
• 1 can stewed tomatoes
• 1 tsp. oregano
• 1 tsp. Italian seasoning
• salt/pepper
• 10 oz. frozen spinach, thawed or fresh spinach) (optional)
• 16 oz. bowtie pasta, cooked
• � cup parmesan cheese, shredded
• 1� cup mozzarella, shredded