Heat oven to 350°F. Spray a 13" x 9" oven-safe casserole with no-stick cooking spray; set aside.
Heat water, butter, garlic salt and onion salt to boiling in a 6 quart Dutch oven. Remove from heat. Add cream cheese, milk and sour cream, stirring until cream cheese is dissolved.
Stir in potato flakes, mixing until all ingredients are well-combined. Spread mashed potato mixture into prepared pan.
Sprinkle with paprika and bake 1 hour or until bubbling around edges and golden brown. Top with chopped bacon and parsley, if desired.
TIP: Before adding paprika and baking, potato mixture can be covered and stored in the refrigerator for up to 48 hours.
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