01 - Preheat your oven to 375°F, positioning the rack in the center position for even heat distribution.
02 - In a large mixing bowl, combine softened cream cheese, sour cream, and mayonnaise. Beat with a hand mixer or stir vigorously until completely smooth and no lumps remain.
03 - Add mozzarella, Parmesan, drained spinach, chopped artichokes, minced garlic, salt, black pepper, and red pepper flakes to the bowl. Mix thoroughly until all ingredients are evenly distributed throughout the creamy base.
04 - Spread the mixture evenly into an 8x8-inch baking dish or similar shallow dish, smoothing the top with a spatula.
05 - Bake for 25 minutes until the dip is bubbly around the edges and the top develops a light golden-brown color.
06 - Remove from oven and let cool for 5 minutes. Serve immediately with tortilla chips, sliced baguette, or fresh vegetable crudites.