Baking powder, 1 tsp: 1/2 tsp cream of tartar plus 1/4 tsp baking soda
Buttermilk: 1 tablespoon lemon juice, then add enough milk to make 1 cup. Let sit for 5 minutes before using.
Broth, chicken or beef, 1 cup: 1 tsp or 1 cube instant beef or chicken bouillon plus 1 cup hot water
Egg: 1 tbsp ground flaxseed plus 3 tbsp water, stir
*Will add more as I use them!