Red Velvet Mug Cake Recipe | Epicurious

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