Preheat: First, preheat your oven to 375°F (190°C). Spray a small baking dish with cooking spray.
Dry Spinach: Place the thawed spinach in a clean towel. Squeeze tightly over the sink until no more water comes out.
Mix Base: Next, in a large bowl, whisk together the softened cream cheese, Greek yogurt, garlic, salt, pepper, and red pepper flakes until smooth.
Add Mix-Ins: Stir in the dried spinach, chopped artichokes, parmesan, and 1/2 cup of the mozzarella cheese. Mix well.
Assemble: Spread the mixture evenly into the baking dish. Top with the remaining 1/2 cup of mozzarella cheese.
Bake: Finally, bake for 20-25 minutes until the cheese is melted and golden brown. Serve warm.