INGREDIENTS
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3 very ripe bananas, mashed well
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1 large egg, at room temperature (the temp here is important because a cold egg will congeal the oil/butter)
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2 tablespoons sour cream, or creme fraiche, or Greek yogurt
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2 ounces shot of espresso (or absurdly strong coffee)
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1 teaspoon vanilla extract
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1 teaspoon instant espresso granules
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1/3 cup melted coconut oil (or melted, unsalted butter)
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3/4 cups granulated sugar
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1 1/2 cup all purpose flour (whole wheat pastry flour would also work well)
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1 teaspoon baking soda
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1 teaspoon Kosher salt