3/4 cup (90 grams/3 ounces) all-purpose flour

3/4 cup (150 grams/5 ounces) white sugar

1/4 cup (30 grams/1 ounce) dark cocoa powder (I use Cacao Barry Extra Brute)

3/4 teaspoon (2.5 grams) baking soda

3/4 teaspoon (2.5 grams) baking powder

3/4 teaspoon (2.5 grams) cornstarch

1/2 teaspoon (3 grams) salt

1/3 cup (70 mL) buttermilk

1/4 cup (60 mL) brewed coffee or espresso, hot

3 tablespoons (45 mL) vegetable oil

1 egg, room temperature

1 1/2 teaspoons (7.5 mL) pure vanilla extract (I use Nielsen-Massey)