Preheat oven to 400 degrees. Coat a 9-inch pie plate or other baking dish with nonstick cooking spray.
In a medium bowl, add cream cheese, mayonnaise, and sour cream and mix until smooth. Stir in artichoke hearts, spinach, mozzarella cheese, and salt and pepper to taste (I like ½ teaspoon salt and ¼ teaspoon pepper).
Spread evenly into prepared baking dish and cover with foil. Bake until hot and bubbly, about 35 to 40 minutes. Serve with tortilla chips or crusty bread.
