Flour, eggs, vanilla, milk or water, a little bit of sugar, baking soda and powder (or yeast), lemon juice, a pinch of salt, etc. You could use yeast or baking soda and powder and a rising agent.
Home made baking mix contains Flour, shortening, baking soda, sugar and salt. It is easy to make ahead of time and store. You can use it for biscuits, pie crusts or pancakes!