Crumble Speckled Corn Bread; set aside. Bake biscuits according to package directions; cool. Tear 8 biscuits into small pieces, reserving remaining 2 for another use. Combine crumbled corn bread, torn biscuits, sage, poultry seasoning, and pepper in a large bowl.
Preheat oven to 350°.
Melt the margarine over medium-high heat in a medium nonstick skillet coated with cooking spray. Sauté celery and onion 8 minutes or until tender. Cool slightly. Add vegetable mixture to dressing mixture; gently stir in broth and egg whites. Spoon mixture into a 13 x 9-inch baking dish coated with cooking spray. Bake at 350° for 55 minutes.