It's finally here! This 13oz. shelf stable mix includes our buttermilk biscuit recipe ever so adjusted to enhance the texture and flavor of the gluten free biscuit. 12 Month Shelf Life. Simply incorporate the butter, cream cheese and buttermilk with one bag of Callie’s Buttermilk Biscuit Mix to make one dozen tender, buttery biscuits. Please note they have provided extra in each bag for dusting your rolling pin, biscuit cutter, and surface.