Bake biscuits according to package directions; let cool. Tear 8 of the biscuits into small pieces; reserve remaining 2 for another use.
Combine crumbled corn bread, torn biscuits, sage, poultry seasoning, and pepper in a large bowl; set aside.
Preheat oven to 35
Melt margarine over medium-high heat in a medium nonstick skillet coated with cooking spray. Saut celery and onion 8 minutes or until tender.
Let cool slightly.
Add vegetable mixture to dressing mixture, and gently stir in broth and egg whites. Spoon mixture into a 13 x 9-inch baking dish coated with cooking spray.