Preheat oven to 350℉ and add cupcake liners to the muffin pan.
In a large mixing bowl or bowl of a stand mixer, combine the flour, sugar, cocoa powder, hot cocoa mix, salt, baking powder and baking soda.
2 cups + 2 tablespoons all-purpose flour, 1 1/2 cups sugar, 1/2 cup cocoa powder, 1/2 cup hot cocoa mix, 1 teaspoon salt, 1 teaspoon baking powder, 2 teaspoons baking soda
In a separate bowl, whisk together the oil, buttermilk, and eggs.
1/2 cup vegetable oil, 1 cup buttermilk*, 2 eggs
Pour the wet ingredients into the mixing bowl with the dry ingredients.
Stir until combined, scraping down the sides of the bowl at least once or twice.
Slowly add the hot water and mix until combined.
1 cup hot water
Fill each cupcake liner about 2/3 full and bake for 15-17 minutes.
Let cool completely before frosting.