Preheat the oven to 400 degrees. Prep a muffin tin with non stick spray or olive oil.On a lightly floured surface roll out the pizza crust rectangle to about 14"x12".
With a pizza cutter, cut 8 even strips (easiest way is to cut the rectangle in half, then cut each half in half, then cut each of those pieces in half)
Spread 1 tbsp of marinara or pizza sauce on each strip, divide the pepperoni evenly on all 8 strips of dough, top with the mozzarella cheese.Roll the pizza dough strips up, so they look like cinnamon rolls, keeping the filling inside of the roll. Place them in the prepped muffin tin.
Mix together the melted butter and garlic powder. Brush the tops of all the pizza roll ups with the garlic/butter mixture.
Bake for 15 minutes, until the tops of the roll ups are golden. Let cool for 5 minutes before eating.
Store in the refrigerator for up to 5 days. These make excellent lunches for the kids to take to school!