Spray the stoneware container of Crockpot with a light mist of cooking spray.
To Crockpot add: Spinach, artichoke hearts, 1 cup of mozzarella cheese, cream cheese, Parmesan cheese, garlic, red pepper flakes, black pepper and juice of 1 lemon.
Place lid on Crockpot and cook on HIGH for 1 hour. After 1 hour, add in the remaining half cup of mozzarella cheese, stir well and replace lid. Cook on LOW for 30 minutes to 1 hour, to allow cheese to melt and dip flavors to combine.
Stir well and serve with pita chips, toast points or crackers of your choice.