How to Pound Chicken Breasts
Place two of the chicken breasts in large freezer-weight resealable plastic bag. Pound chicken with the side of a heavy can, rolling pin or meat mallet until chicken is 1/4-inch thick. Remove chicken from bag; set aside. Repeat with remaining chicken breasts.
Substitute 6 fish fillets (1-1/2 lb.) for the chicken. Brush fish evenly with the mustard mixture. Roll up and place in baking dish as directed. Bake at 375°F for 10 to 15 min. or until fish flakes easily with fork.