MIX first 4 ingredients until blended. Combine crabmeat, cracker crumbs, onions, peppers and baking powder in medium bowl. Add 2/3 cup cream cheese mixture; mix lightly. Shape into 12 (1/2-inch-thick) patties. Refrigerate 30 min.
COOK crabmeat patties, in batches, in large nonstick skillet on medium heat 6 min. or until golden brown on both sides, carefully turning after 3 min. Meanwhile, mix remaining cream cheese mixture, celery and pepper sauce until blended.
SERVE crab cakes with cream cheese sauce.