Heat oven to 350°F. Grease 8 (10-oz) ramekins, custard cups or large muffin cups.
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.
Bake 17 to 20 minutes or until biscuits are golden brown.