In 10-inch skillet, melt butter; stir in flour and pepper. Cook about 1 minute, stirring constantly, until smooth and bubbly. Gradually stir in broth and 3/4 cup milk; cook until mixture boils and thickens, stirring constantly. Add chicken, onion, mushrooms, peas and carrots; cook until hot and bubbly. Spoon mixture evenly into ramekins. Separate dough into 8 biscuits. Press each to make 4 1/2-inch round. Place biscuit rounds on tops of filled ramekins. Cut slits in biscuit tops. Brush biscuit tops with additional milk. Sprinkle with sesame seed.