Using a stand mixer, mix together the cream cheese, mayonnaise, sour cream, 1/2 cup mozzarella, parmesan, pecorino romano cheese, and minced garlic. Mix for 30 seconds or until incorporated. Season with salt and pepper to taste.
Then, fold in the thawed and drained spinach and the chopped artichoke hearts.
Grease a baking dish with cooking spray. Transfer the spinach dip to the baking dish. Top with 1/4 cup mozzarella cheese.
Bake for 20 minutes or until golden brown and bubbly. Serve immediately with tortilla chips and vegetables!