Preheat the oven to 400 if you are going to cook some right away.
Mix the dry ingredients in a large bowl.
Mix the applesauce, beaten eggs, and buttermilk together.
Add the wet into the dry and stir to combine.
Don't stir it again after the initial mixing. Just scoop out as much as you need each time you use it.
To bake, fill the muffin tin about 2/3rds full and bake at 400 for 15 - 20 minutes
Store the batter in a covered container in the refrigerator for up to 6 weeks. Don't stir it.