Italian Beef casserole with Bow Tie Pasta

1 1/2 lbs. lean ground beef
1 onion, chopped
1 clove garlic, minced
1 (15 oz.) can tomato sauce
1 can stewed tomatoes
1 teaspoon oregano
1 teaspoon Italian seasoning
salt/pepper
fresh spinach
16 oz. bowtie pasta, cooked
1/2 cup parmesan cheese, shredded
2 cups mozzarella, shredded

Brown ground beef with onion and garlic. Put in crock-pot and add sauce, tomatoes and seasonings. Cook for 6-7 hours on low. During the last 30 minutes of cook time, add the fresh spinach, bow tie pasta, parmesan cheese and 1 cup of mozzarella cheese and mix in well. Then turn the crock-pot to high. Then add the last cup of mozzarella to melt on top.