Pre-heat your slow cooker/crock pot by turning it on the "high" setting.
Thaw your spinach in the microwave until it can be separated and no more ice is found.
Place your sour cream, mayo, 1/4 cup Parmesan, garlic, Franks Red Hot sauce and one tablespoon each of Mrs. Dash, Onion and Garlic powder into the slow cooker; whisk until well blended.
Chop your artichoke hearts; set aside.
Blend cream cheese, remaining Parmesan cheese, Mozzarella cheese and one tablespoon each of Mrs. Dash, Onion and Garlic powder into the bowl of thawed spinach; cream together.
Add artichoke hearts and creamed spinach into slow cooker, blend together; taste and add seasoning or hot sauce to taste.