Lightly grease a large baking sheet; set aside. Split pita bread rounds in half horizontally; cut each half into three wedges. Brush pita wedges with olive oil. In a custard cup combine garlic powder, salt, chili powder, and, if desired, cayenne pepper. Sprinkle garlic powder mixture over pita wedges.
Place pita wedges on prepared baking sheet. Bake about 15 minutes or until golden brown and toasted.