Ingredients cooking spray 1 teaspoon all-purpose flour 1 cup granulated sugar 1/3 cup butter or stick margarine, softened 2 large egg whites 1 large egg 1 tablespoon grated lemon rind 1 teaspoon vanilla extract 1 2/3 cups all-purpose flour 2 tablespoons poppy seeds 1 teaspoon baking powder 1/4 teaspoon baking soda 1/9 teaspoon salt 3/4 cup low-fat buttermilk 2/3  cup…