Tear one hamburger bun into pieces. Place in food processor or blender container. Cover; pulse on and off, to form fine crumbs.
Combine bread crumbs, Ground Beef, garlic and chili powder in medium bowl, mixing lightly but thoroughly. Lightly shape into eight 1/2-inch thick mini patties.
Cook's Tip: One-half teaspoon chili powder may be substituted for chipotle chili powder.
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.
Place burgers on bottoms of remaining eight buns. Top with desired Toppings. Close sandwiches.