Start by preheating your oven to 375°F. Line a 12-cup muffin pan with cupcake liners.
In a large bowl with an electric mixer, beat together 1 cup granulated sugar and the orange zest until combined.
Add the 1 cup all-purpose flour, ½ cup natural cocoa powder, ¾ teaspoon baking soda, ¾ teaspoon baking powder, and ½ teaspoon kosher salt, mix until combined on low.
In another bowl, beat together 1 large room temperature egg, 1 teaspoon vanilla extract, ¼ cup milk, ¼ cup vegetable oil, and ¼ cup room temperature sour cream.
Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
Pour the hot coffee into the batter and beat until fully incorporated. Do not over mix.
Divide the batter evenly among the 13 cupcake liners, filling each about ⅔ full
Position it on the center rack of the oven to ensure even baking, avoiding placement too close to the top or bottom. Bake in the preheated oven for 12-14 minutes, or until a toothpick inserted into the center of a cupcake comes out clean.
Allow the cupcakes to cool in the pan for 5 minutes, then transfer them to a wire rack to cool completely before frosting.