Ingredients

• Butter, for greasing the mugs
• 1/2 cup buttermilk
• 1/2 cup sugar
• 1/4 cup vegetable oil
• 1 large egg
• 1/2 teaspoon vanilla extract
• 1/3 cup all-purpose flour
• 2 tablespoons Dutch-process cocoa powder
• 1/8 teaspoon baking soda
• A pinch of salt

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Instructions

1. Lightly butter 4 small microwave-safe mugs. Whisk together the buttermilk, sugar, oil, egg and vanilla in a large bowl until smooth, about 2 minutes. Whisk in the flour, cocoa powder, baking soda and salt until just combined.
2. Pour 1/3 cup batter into each mug. Microwave, one at a time, until puffed and a toothpick inserted into the center comes out clean, about 2 minutes. (Continue microwaving in 15-second intervals, if needed.) Let cool slightly. Top as desired.