Preheat oven to 350 degrees. Prepare 2 quart 9 inch round baking dish with non stick spray.
Heat water,butter, garlic salt, and onion salt to boiling in a 6 quart Dutch oven or saucepan. Remove from heat.
Add cream cheese, milk and sour cream, stirring until cream cheese is dissolved. Then stir in potato flakes, mixing until all ingredients are well combined. Spread mashed potato mixture into prepared baking dish.
Sprinkle with paprika and bake one hour or until bubbling around edges and golden brown.