Combine the dry ingredients (start with 2-1/2 cups Maseca) then warm buttermilk and add to mixture. Mix by hand until everything is wet. Cover and let sit 10-15 minutes. Knead lightly and add Maseca until a finger pressed into the ball of dough comes out mostly clean. Make two inch balls with the dough. This recipe makes about 12 tortillas. Cook each side of the tortillas 45-50 seconds. Press, heat, and serve!