Chocolate Banana Bread Babka
Dough:
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⅔ cup whole milk
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2 + ⅔ cups all-purpose flour
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¾ cup whole-wheat flour
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⅓ cup light brown sugar
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2 tsp instant yeast
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½ tsp fine sea salt
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½ tsp ground cinnamon
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2 medium ripe bananas (mashed)
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1 large egg
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1 large egg yolk
Filling:
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½ cup heavy cream
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6 Tbsp unsalted butter
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½ cup light brown sugar
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5 oz. bittersweet chocolate (finely chopped)
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1 + ½ tsp pure vanilla extract
Streusel:
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½ cup all-purpose flour
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¼ cup light brown sugar
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2 Tbsp cocoa powder
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½ tsp fine sea salt
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5 Tbsp unsalted butter (melted)
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1 medium ripe banana (finely chopped)
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In a small pot, heat the milk for the dough over medium heat until it’s just warm to the touch, about 2 minutes. Check the temperature, it should be about 95°F.
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In the bowl of an electric mixer fitted with the dough hook attachment, mix the all-purpose flour, whole-wheat flour, brown sugar, yeast, salt, and cinnamon on low to combine. Add the warm milk, mashed bananas, and eggs. Mix on low for 3 minutes. Increase the speed to medium and mix for 2 more minutes. Transfer the dough to a lightly greased bowl, cover it with plastic wrap, and let it rise in a warm place for an hour.
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Meanwhile, make the filling. In a medium pot, combine the heavy cream, butter, brown sugar, chocolate, and vanilla extract. Heat the mixture over medium-low heat, stirring constantly until the chocolate and the butter are melted and the sugar has dissolved, about 3 minutes. Transfer the mixture to a medium bowl and let it cool to a spreadable consistency.
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In a medium bowl, whisk the flour, brown sugar, cocoa powder, and salt. Add the melted butter and stir with a silicone spatula until the mixture forms moist crumbs, Gently stir in the banana pieces.
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When the dough has risen slightly, lightly grease a 9×5-inch loaf pan with nonstick spray. On a lightly floured surface, roll out the dough into a rectangle about 14 x 18-inches. Dollop the filling all over the dough, using an offset spatula to spread it into an even layer across the dough all the way to the edges. Sprinkle three-quarters of the streusel evenly over the filling.
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Starting on the shorter sides, roll the dough into a tight spiraled log, Use a bench scraper or a knife to cut the log in half lengthwise. Twist the two halves together, then transfer them to a prepared loaf pan. Sprinkle the remaining streusel over the loaf. Cover it with plastic wrap and let it rise in a warm place until it looks noticeably puffy, about 35-40 minutes.
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Preheat the oven to 350°F. Bake the loaf until it has browned on the surface and appears fully set all the way through.
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Let the loaf cool inside the pan for 20 minutes, then unmold it onto a wire rack and cool completely before slicing and serving.