HEAT oven to 375ºF.
COMBINE bread crumbs and seasonings; stir in chipotle cheese. Reserve 3/4 cup chipotle cheese mixture.
MIX cream cheese and mayo in medium bowl until blended. Add chicken, celery, 1 Tbsp. peppers and remaining chipotle cheese mixture; mix well.
SPREAD cream cheese mixture onto bottom of 9-inch pie plate sprayed with cooking spray; top with reserved chipotle cheese mixture and remaining peppers.
BAKE 25 min. or until heated through. Sprinkle with onions.