6 cups flour
2 cups whole wheat flour
1 cup cornmeal
1 1/2 cups dry buttermilk
1/3 cup sugar
1 tsp. soda
4 tsp. salt
4 Tbsp. baking powder

Mix well, store in a tightly covered container.  To use:

3 cups mix
3 eggs
1 1/2 Tbsp. oil
water to desired consistency