Heat grill to medium direct heat. Meanwhile, crumble meat into medium bowl. Sprinkle with onion, chili powder, cumin, oregano, garlic pepper and salt, if desired; toss lightly with 2 forks to mix well. Shape into 6 patties, each 3/4 inch thick.
Place burgers on grill. Grill, covered, 5 to 7 minutes per side or until done (160°F). Top each burger with a slice of cheese, if desired, and place buns, cut side down, on grill during last 1 to 2 minutes of cooking.
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