chocolate cupcake recipe

1 cup (125g) all-purpose flour (spooned & leveled) 1/2 cup (42g) unsweetened natural cocoa powder 1 teaspoon baking soda 1/2 teaspoon baking powder 1/2 teaspoon salt 1/3 cup (80ml) vegetable oil 1 cup (200g) granulated sugar 1 large egg, at room temperature 1 teaspoon pure vanilla extract 1/2 cup (120ml) buttermilk*, at room temperature 1/2 cup (120ml) hot water or hot coffee (decaf is fine)