In a large skillet, brown the ground beef with the chopped onion and minced garlic
Put the cooked beef mixture into the crockpot, and add the tomato sauce, stewed tomatoes, one cup of water, and seasonings. Cook for 6 hrs on low
Thirty minutes before cooking time is over, add the thawed spinach and bowtie pasta
Before serving, add the cheeses, mix and let them melt for a few minutes