Heat oven to 375°F. Separate dough into 10 biscuits; place on ungreased cookie sheet.
Melt margarine in small saucepan over medium heat. Add onions; cook and stir until tender. Spoon mixture evenly over biscuits. Sprinkle with pepper.
Bake at 375°F. for 15 to 20 minutes or until biscuits are golden brown.