01 - Preheat oven to 375°F.
02 - Combine softened cream cheese, sour cream, and mayonnaise in a large mixing bowl. Mix until smooth and creamy.
03 - Stir in mozzarella, Parmesan, spinach, artichoke hearts, garlic, salt, black pepper, and red pepper flakes until evenly distributed.
04 - Spread mixture evenly into a medium baking dish (approximately 8x8-inch).
05 - Bake for 25 minutes until dip is bubbly and lightly golden on top.
06 - Serve warm with tortilla chips, sliced baguette, or fresh vegetables.