Melt the chocolate over a double boiler and set aside to cool down.
¼ cup Semi-sweet chocolate
Melt the butter in the microwave at 20-sec intervals, and set it aside.
¼ cup Butter
Preheat the oven to 350°F nd line a muffin tray with 24 cavities and set it aside.
Sift all dry ingredients and set aside.
1¼ cup All-purpose flour, ½ teaspoon Baking soda, ½ teaspoon Espresso powder, ¼ teaspoon Salt, ½ cup Dark cocoa powder
Using a whisk attachment whisk the melted butter, oil, and sugar until well mixed and lighter.
1¼ cup Sugar, 1 cup Olive oil, ¼ cup Butter
Add in vanilla extract, eggs, and egg yolk, one at a time. Mix well
2 Eggs, 1 Egg yolk, 1 tablespoon Vanilla extract
Add in the sourcream and mix.
⅓ cup Sour cream
Switch to a rubber spatula, start with dry ingredients, and alternate with brewed coffee. Three passes of dry ingredients and two passes of coffee. Start and finish with dry ingredients.
½ cup Brewed coffee
Do not overmix. Scoop the batter into the ⅔ of the cupcake liners. Bake for 15-18 minutes. Let cool down for 10 minutes before transferring it to the cooling rack.