Place 12 frozen rolls in a greased muffin tin. Allow to rise for about 2 1/2 hours. Flatten rolls one at a time on a clean surface. Sprinkle with pepperoni slices and mozzarella cheese. Carefully fold over the sides to cover the toppings. Place back in the pan and repeat with other rolls. Add garlic powder and Italian seasoning to the melted butter and mix well. Brush mixture over each roll. Bake 15-17 minutes at 350°. Serve with pizza sauce.