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Preheat the oven to 350°F. Line a 9-x-5-inch loaf pan with parchment so that it extends up the two long sides, creating a sleeve. Spray with non-stick spray.
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Whisk the flour, baking soda, and salt together in a large bowl. In another bowl, stir together the bananas, sugar, almond milk, oil, and vanilla. Gently stir the wet ingredients into the flour mixture just until combined.
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Scoop a third of the batter in a separate bowl. Stir in the cocoa and espresso powder until well incorporated.
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Alternately spoon the plain banana batter and the mocha batter into the prepared pan. Using a butter knife, gently swirl them together a little bit. Bake the cake until golden-brown and a tester inserted in the center comes out clean, 50 to 55 minutes. Cool completely in the pan, then lift out using the parchment as handles.