Preheat oven to 350 degrees F. In food processor pulse the artichokes and spinach until finely chopped.
In a mixing bowl combine the cream cheese, sour cream, ¾ cup of the mozzarella, parmesan, romano, garlic powder, salt and pepper.
Stir well and then fold in the artichoke/spinach mixture until well incorporated.
Spray an oven proof casserole dish. Pour mixture into casserole dish then top with ¼ cup of mozzarella cheese and bake uncovered for 20 minutes at 350 degrees F until mixture is bubbly and cheese melted through.
Remove from oven and serve this artichoke spinach dip HOT with your favorite chips.