Lay chicken breast in crockpot
Mix garlic powder, salt, pepper, and Italian seasoning together and sprinkle over the chicken patting it so it sticks
Sprinkle parmesan cheese over the chicken then pour marinara on top covering the top and sides of the chicken
Cover and cook on low 3 ½ hours
Uncover and sprinkle mozzarella cheese over chicken
Cover and cook an extra 30 minutes