For the Cupcakes:
4 tablespoons unsalted butter, at room temperature
¾ cup granulated sugar
1 egg
2½ tablespoons unsweetened cocoa powder
3 tablespoons red food coloring
½ teaspoon vanilla extract
½ cup buttermilk
1 cup + 2 tablespoons all-purpose flour
½ teaspoon salt
½ teaspoon baking soda
1½ teaspoons distilled white vinegar

For the Cream Cheese Frosting:
4 ounces butter, at room temperature
4 ounces cream cheese, at room temperature
2½ cups powdered sugar
1 tablespoon vanilla extract