These Double Chocolate Chip Muffins are a chocolate lover's dream - a rich chocolate muffin studded with lots of semi-sweet chocolate chips. Enjoy with a large glass of milk for an indulgent afternoon snack.
Preheat oven to 425°F. Line 2 12-count muffin pans (16 muffin cups) with cupcake liners and set aside.
In a large bowl, whisk together dry ingredients - flour, sugar, cocoa powder, baking soda, salt, and chocolate chips. Set aside.
In a medium bowl, whisk together wet ingredients - eggs, sour cream, oil, milk, and vanilla extract. Pour wet ingredients into dry ingredients and fold together with a rubber spatula until completely combined. The batter will be very thick.
Use a standard sized ice cream scoop to portion batter into prepared muffin pan, filling all the way to the top but not overflowing. Bake for 5 minutes at 425°F. Without opening oven, reduce oven temperature to 350°F. Bake for an additional 15-16 minutes, rotating pans halfway through, or until a toothpick inserted in the center comes out clean.
Cool muffins for 10 minutes in the pan, then transfer to a wire rack to cool completely.
Store in an airtight container. Muffins will keep for 5 days at room temperature or up to a week in the fridge.