Heat oven to 350°F. Lightly grease cookie sheets. Separate dough into 8 biscuits. Press or roll each to form 5 1/2-inch round. Place on greased cookie sheets. Bake at 350°F. for 15 to 17 minutes or until light golden brown.
Meanwhile, in large bowl, combine ground beef, onion, salt, pepper and garlic powder; mix well. Shape mixture into 4 (5-inch) patties. Heat 12-inch nonstick skillet over medium heat until hot. Add patties; cook 10 to 12 minutes or until thoroughly cooked, turning once.
Place 4 baked biscuits,bottom side up, on plates. Top each with patty, lettuce, tomato and onion. Top each with baked biscuit, bottom side down.