Ingredients

  • 1 large egg
  • 3 tablespoons vegetable oil
  • 1 teaspoon liquid red food coloring
  • 3 tablespoons buttermilk
  • 2 teaspoons pure vanilla extract
  • 1/4 cup granulated sugar
  • 2 tablespoons unsweetened cocoa powder
  • 1/4 cup self-rising flour
  • Pinch of kosher salt
  • 1/4 teaspoon cider, white, white wine, or rice vinegar

Method

  • In a large mug, whisk together the egg and oil with a fork. Stir in the food coloring, buttermilk, vanilla, and sugar. Add the cocoa, flour, salt, and vinegar. Beat the batter until smooth. Divide the batter between two mugs. Microwave separately for 1 1/2 to 2 1/2 minutes each until risen and firm.