Preheat oven to 400°F.
Roll pizza dough out to approximately a 16" x 14" square.
Spread pizza sauce over the dough, and top with mozzarella, spinach, and pepperoni. Sprinkle garlic powder and salt/pepper on top.
Roll dough cinnamon roll style and cut into 12 slices. Place in a greased baking dish and bake for about 13-15 minutes, or until dough is golden brown.
Cool for 5 minutes and serve with remaining pizza sauce for dipping! Enjoy!