HEAT oven to 400ºF. Mix 3 Tbsp. Miracle Whip, the milk and pepper. Marinate chicken in Miracle Whip mixture in resealable plastic bag in refrigerator 30 min.
POUR coating mix onto plate. Dip chicken, one strip at a time, in coating mix, turning to evenly coat; discard marinade. Place in single layer on baking sheet.
BAKE 20 min. or until chicken is cooked through. Meanwhile, mix remaining Miracle Whip, ranch dressing and onions. Serve as a dipping sauce for the chicken.