Preheat oven to 350°F and line a cupcake pan with paper or foil liners.
Combine the flour, cocoa powder, baking powder, baking soda, and salt in a small bowl
1 cup all purpose flour, 1/2 cup unsweetened cocoa powder, 1 teaspoons baking powder, 1/2 teaspoon baking soda, 1/4 teaspoon salt
Combine the sugar, vegetable oil, eggs, vanilla and mint extracts in a second large bowl. Whisk well.
1 cup granulated sugar, 1/4 cup vegetable oil, 2 eggs, 1 teaspoon vanilla extract, 1/2 teaspoon mint extract
Mix in half of the dry ingredients and half of the buttermilk.
1/2 cup buttermilk
Repeat with the remaining dry ingredients and buttermilk until everything is incorporated just blended. Be cautious not to over-mix the batter.
Fill each cupcake liner 1/2 to 2/3rds full with the batter.
Bake for 18 to 20 minutes or until a toothpick inserted into the center of a cupcake comes out clean.