½ cup (60 g / 2 oz) SIFTED unsweetened cocoa powder (I use Dutch-processed)
1 cup buttermilk (250ml) (or use regular milk mixed with 1 tablespoon of vinegar)
½ cup (125ml) light vegetable oil
1 medium egg, at room temperature
70g (2.4oz) dark chocolate, cut into chunks
70g (2.4oz) milk chocolate, cut into chunks
30g (1oz) white chocolate, cut into chunks
Instructions
Preheat the oven to 425°F / 218°C.
Line the pan with the liners. Set aside.
In a large mixing bowl, whisk together the flour, baking soda, baking powder, salt, sugar and sifted cocoa powder.
Pour in the buttermilk, oil, and egg and mix with a hand mixer until just combined. The batter is supposed to be somewhat thick.
Gently fold in the chopped chocolate chunks. I usually do about 3-4 folds.
Divide the batter into the lined muffin pan. Make sure to fill all the way to the top.
Bake at 425℉ / 218℃ for exactly 5 minutes, and then lower the temperature to 350℉ / 180℃ (without opening the oven door) and bake for another 15-20 minutes or until a toothpick inserted in the middle comes out clean.
Let the muffins cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely.