Heat oven to 350°F. Spray 13x9-inch (3-quart) baking dish with nonstick cooking spray. Arrange potato slices in sprayed baking dish; top with onion. Pour gravy over potatoes and onion. Cover tightly with foil.
Bake at 350°F. for 30 to 35 minutes or until potatoes are tender.
Meanwhile, sprinkle both sides of pork chops with garlic-pepper blend. Spray large nonstick skillet with nonstick cooking spray. Heat over medium-high heat until hot. Place chops in pan. Cook 1 to 2 minutes on each side or until browned.
Place pork chops over potato mixture. Cover; bake an additional 15 to 20 minutes or until pork is no longer pink.