1) Tear one hamburger bun into pieces. Place in food processor or blender container. Cover; pulse on and off, to form fine crumbs. 2) Combine bread crumbs, beef, garlic and chili powder in medium bowl, mixing lightly but thoroughly. Lightly shape into eight 1/2-inch thick mini patties. 3) Place patties on grill over medium, ash-covered coals. Grill, covered, 8 to 9 minutes (over medium heat on preheated gas grill, 9 to 10 minutes) until instant-read thermometer inserted horizontally into center registers 160°F, turning occasionally. Evenly top with cheese during last minute of grilling. 4) Place burgers on bottoms of remaining eight buns. Top with desired Toppings. Close sandwiches. Cooking times are for fresh or thoroughly thawed Ground Beef. Color is not a reliable indicator of Ground Beef doneness.