Preheat oven to 350 degrees. Butter a small casserole dish and set aside.
Place defrosted spinach and artichokes into a colander and press very firmly to squeeze out as much liquid as possible. Transfer both to a cutting board, chop coarsely then set aside.
Add cream cheese to a medium mixing bowl and soften in the microwave for about 30 seconds or until the cream cheese is very soft—about the consistency of mayonnaise.
Add chopped spinach and artichokes, sour cream, salt, red pepper flakes and garlic powder then stir until well combined. Fold in mozzarella cheese and Parmesan cheese until ingredients are well combined. Transfer to prepared casserole dish.
Bake 20–25 minutes or until heated through and lightly browned on top. Cooking time may vary based on the shape and depth of the casserole dish being used, so keep an eye on it! Remove from oven and allow to cool for at least 5 minutes before serving with your favorite chips, crackers, bread or veggies. Enjoy!
You can kick up this recipe by mixing in 1 cup of shredded pepper jack cheese for some extra spice!