270g Chocolate chips or chunks (approx 1 1/2 cups)
Instructions
Preheat your oven to 200°C (400°F). Line a muffin pan with 6 tall paper liners or grease it lightly.
In a microwave-safe bowl, melt the butter and 90g of chopped chocolate in 20-30 second intervals, stirring between each interval until smooth. Alternatively, you can melt them together in a heatproof bowl over a pot of simmering water (double boiler method). Set aside to cool slightly.
In a large mixing bowl, whisk together the vegetable oil, eggs, brown sugar, and granulated sugar until well combined. Add the buttermilk (or milk with vinegar) and the melted butter-chocolate mixture, and whisk until smooth.
Sift in the all-purpose flour, cocoa powder, and baking powder.
Add the salt and stir until just combined. Do not overmix; a few lumps are okay.
Gently fold in the chocolate chips or chunks until evenly distributed throughout the batter.
Divide the batter evenly among the muffin cups, filling each about 2/3 to 3/4 full.
Bake in the preheated oven for 8 minutes, then turn down the oven to 180°C (356°F) 18-20 minutes, or until a toothpick inserted into the center of a muffin comes out with a few moist crumbs.
Allow the muffins to cool in the tin for about 5 minutes, then transfer to a wire rack to cool completely.