Place the softened cream cheese, sour cream, and mayonnaise in a large bowl. Add in the pressed garlic and stir to combine.
Add in the parmesan, ½ the mozzarella, spinach, and artichoke. Stir to combine.
Spray a 9x9 in. baking sheet with oil and pour in the dip. Sprinkle the remaining mozzarella cheese on top.
Bake at 400°F for 20 minutes, or until the top is slightly bubbly. Enjoy immediately with your favorite chips or crackers!