Dice the bell peppers, shred mozzarella cheese if necessary.
Measure out all ingredients.
Preparation
In a large skillet, brown the beef over medium heat. Drain off any excess fat.
Add diced bell peppers, macaroni, marinara sauce, and water. Bring to boil then reduce heat. Cover and simmer for about 20 minutes, until macaroni is tender, occasionally stirring.
Add milk and spinach. Stir slowly until the spinach wilts.
Sprinkle with cheese and stir well. Remove from heat, cover and let sit for about 2 minutes or until the cheese melts.