Preheat the oven to 350℉, and line a 24-cavity cupcake pan with livers.
Start by sifting the dry ingredients, including flour, cocoa powder, Baking powder, and salt.
1½ cup All-purpose flour, 2 teaspoon Baking powder, ½ teaspoon Salt, ⅔ cup Cocoa powder
Mix the heavy cream, oil, and sour cream in a separate bowl and set aside.
¼ cup Oil, ¾ cup Heavy cream, 1 tablespoon Sour cream
Use the paddle attachment to beat the butter and sugar until light and fluffy. Scrape the bowl as needed.
1¾ cup Granulated sugar, ¾ cup Butter
Add the eggs one at a time and mix well before adding the next addition. Add Vanilla extract.
4 Eggs, 1 tablespoon Vanilla extract
Add the dry ingredients alternating with the wet ingredients in three passes; start and finish with dry.
Scoop the batter into the cupcake liners to ¾ capacity of each liner. Bake for 18-20 minutes. Let them cool down before frosting them.