Save your ripe bananas for this healthy marbled bread—it’s just over 200 calories per slice and made with half whole-wheat flour. A small amount of melted chocolate swirled in assures chocolate in every bite.
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To prepare your loaf pan for baking, you can also use a nonstick spray with flour already in it. Flouring the pan helps the bread rise well and prevents any collapse after it comes out of the oven.
Preheat the oven to 350ºF. Lightly mist a 9-by-5-inch metal loaf pan with nonstick cooking spray and dust well with all-purpose flour to cover the pan completely, tapping out the excess.
Put the chocolate in a medium microwave-safe bowl and microwave on high in 30-second intervals, stirring, until melted and smooth, 1 minute to 1 minute 30 seconds. Set aside to cool slightly while preparing the batter.
Combine the bananas and sugar in a large bowl and mash with a potato masher or fork until mostly smooth with just a few small pieces of banana left. Add the oil and eggs and stir until combined. Using a wooden spoon or rubber spatula, mix in both flours, the baking powder, baking soda and salt. Stir in the buttermilk and vanilla.
Stir 1 cup batter into the melted chocolate. Fill the loaf pan with half the banana batter and then half the chocolate batter. Repeat the layers and gently swirl together using a spoon or knife. Bake until golden brown on top and a toothpick inserted in the center comes out clean, about 45 minutes.
Cool in the pan 15 minutes, and then turn out onto a wire rack to cool completely. Serve warm or at room temperature.