The batter for these muffins is exceptionally light and fluffy and the muffins bake up that way, too. Thre are no eggs included, just butter and buttermilk as the flavor carriers and binders, plus yeast to give the batter a boost in the oven. Diced apple, ground ginger, and ground cinnamon lend wonderful flavor and fragrance. Avoid overmixing and also overbaking; the muffins are intended to be on the softer side.