Place frozen rolls in a 9x13-inch baking pan, cover and allow to thaw in the refrigerator overnight (or at least 8-10 hours). When ready, combine two thawed rolls. Spray counter and hands lightly with cooking spray and press combined rolls into a rough 8''x3'' rectangle. Fill the center with about 2 Tablespoons of shredded cheese and a heaping Tablespoon of mini pepperoni.
Fold up sides and pinch together to seal; cross one side over the other and tie into a knot. Place on a greased baking sheet. Repeat. You will have 12 knots total. Brush tops with melted butter and sprinkle with a little garlic powder. Cover lightly with plastic wrap that has been sprayed with cooking spray and allow to rise for 30 minutes.
Preheat oven to 350 degrees. Remove plastic wrap and bake for about 20 minutes or until top is golden brown. Serve with pizza sauce.