1. Preheat Oven to 375°. 2. Sauté the onions and celery in the butter until the onions are mostly clear. 3. In a 4 quart mixing bowl add cornbread, crumbled white bread, black pepper, eggs, poultry seasoning, and cream of mushroom soup. Lightly mix, add sautéed mixture and one can of chicken booth and mix thoroughly in a folding fashion by hand or with a wooden spoon. Do not use a mixer! 4. Add enough of the second can of chicken broth to make a medium thick batter (adding too much will add to the cooking time and/or make your dressing more watery). This step is to a persons taste as my Mom likes her dressing a lot more moist than most, and I guess I do too. 5. Pour into a 9x13 dish and bake in a 375 degree oven for 30 minutes or until top is browned and "not doughy inside." (Never figured out exactly how to test "not doughy inside." But I kinda shake the pan until it doesn't giggle much in the middle.) Let stand for 30-60 minutes. Taste's better the second day. In my humble opinion.