Dark Chocolate Cupcakes
8 Tbsp Unsalted Butter, Cut Into 4 Pieces
2 Ounces Bittersweet Chocolate, Chopped
1/2 Cup Dutch-Processed Cocoa Powder
3/4 Cup All-Purpose Flour
1/2 Teaspoon Baking Soda
3/4 Teaspoon Baking Powder
3/4 Cup Sugar
1 Teaspoon Vanilla
1/2 Teaspoon Salt
1/2 Cup Sour Cream
Adjust oven rack to lower-middle position and heat oven to 350 degrees. Line 12 muffin cups OR prepare two 6-inch cake pans.
Combine butter, chocolate, and cocoa in medium heatproof bowl. Set bowl over a saucepan of simmering water; heat mixture until melted and whisk until smooth and fully combined. (Alternatively, heat slowly in microwave on 50% power until melted.) Set aside to cool until just warm to the touch.
Whisk the flour, baking soda and powder in small bowl to combine.
Whisk eggs in another bowl; add sugar, vanilla, and salt and whisk until fully incorporated. Add chocolate mixture and whisk until combined. Sift about 1/3 of the flour mixture over the chocolate mixture and whisk until combined. Whisk in the sour cream, then sift the remaining flour mixture over the batter and whisk until homogenous and thick. Divide batter among the muffin tin cups.
Bake until a skewer inserted into the center comes out clean, 18-20 minutes for cupcakes and 25 minutes for cakes.
Frost as desired