In a slow cooker crock, combine potatoes, onions, olive oil, minced garlic, ¾ teaspoons salt, ½ teaspoon black pepper, and paprika, and stir until well coated.
Add chicken pieces on top and season with remaining salt and pepper.
Whisk sauce ingredients together in a bowl and pour mixture over chicken and potatoes.
Cook on High for 4.5 hours (or on Low for 6 hours), or until chicken is cooked through and potatoes are tender. DO NOT OVERCOOK
With about 20 minutes of cooking time left, sprinkle with mozzarella and Parmesan and continue to cook, covered.
