Slice hard-cooked eggs in half lengthwise; carefully remove yolks. Chop egg whites; set aside. Reserve yolks for another use.
Crumble McPherson Corn Bread; set aside. Bake biscuits according to package directions; let cool. Tear 8 biscuits into small pieces; reserve remaining 2 biscuits for another use. Combine chopped egg whites, crumbled corn bread, torn biscuits, sage, and pepper in a large bowl, and set aside.
Bring broth to a boil in a saucepan. Add celery and onion. Reduce heat; simmer, uncovered, 5 minutes. Add broth mixture to corn bread mixture; stir well. Add beaten egg whites; stir well. Spoon mixture into a 2-quart casserole coated with cooking spray. Bake, uncovered, at 400° for 45 minutes.