So, I found two recipes to make your own. Since my recipe called for 1 cup, I made this one.
1 c of baking mix =
3/4 c flour
1 1/2 tsp baking powder
1/4 tsp salt
2 1/2 T shortening
Cut the shortening into the flour mix and there you have it.
If you want to make a whole bunch and keep it airtight or in the refrigerator this site has a large batch recipe.
I'm beginning to like gathering up all the recipes for things that uses essential cooking ingredients, less things on my shelves.