Preheat oven to 375°F (190°C).
In a large mixing bowl, combine light cream cheese and Greek yogurt until smooth.
Stir in minced garlic, red pepper flakes, salt, and black pepper.
Fold in the chopped artichoke hearts and well-drained spinach.
Add 1/4 cup of mozzarella and the Parmesan cheese to the mixture and stir to combine.
Transfer the mixture to a 1-quart baking dish.
Sprinkle the remaining 1/4 cup of mozzarella cheese on top.
Bake for 20 to 25 minutes until the cheese is melted and the dip is bubbling.
Serve warm with whole-wheat pita or vegetable crudités.