01 -
In a skillet over medium heat, sauté ground beef with chopped onion until meat is browned and onion is tender. Drain excess fat.
02 -
Stir in minced garlic and cook for 30 seconds until fragrant.
03 -
Transfer beef mixture to crockpot. Add stewed tomatoes and tomato sauce.
04 -
Add Italian seasoning, oregano, salt, and pepper. Stir well to combine.
05 -
Cover and cook on low heat for 6 hours.
06 -
In the last 30 minutes, stir in Parmesan cheese, half the mozzarella, and spinach.
07 -
Stir in cooked bowtie pasta until well mixed.
08 -
Sprinkle remaining mozzarella on top, allow to melt with lid open, then serve warm.