Walnut Cupcakes with Maple Frosting
Ingredients:Cupcakes:½ cup granulated sugar½ cup packed brown sugar6 tablespoons butter, softened3 large eggs1 teaspoon vanilla extract8 ounces cake flour (about 2 cups)½ teaspoon baking soda¼ teaspoon salt¼ teaspoon ground cinnamon½ cup buttermilk⅓ cup plus 2 tablespoons walnuts, toasted, chopped, and dividedFrosting:½ teaspoon cream of tartar3 large egg whites¾ cup maple sugar or granulated sugar¼ cup…