Preheat the oven to 400 F. Prepare your muffin tin: this recipe claims to make 12 muffins, but for us it made 12 standard muffins and about 20 mini muffins(!). Either generously grease the muffin wells, or line them with muffin liners and lightly spray with oil.

Whisk together the flour, sugar (break up any large lumps), cocoa powder, baking soda and salt. Set aside.

Whisk together the milk, melted butter, and eggs. Add the wet ingredients to the dry ingredients and mix gently until barely combined. Fold in the chocolate chips.

Fill the muffin wells approximately 4/5 full. Place about an inch of water into any un-used muffin wells to prevent burning. Bake for 20 minutes, until a cake tester inserted into the center of one of the muffins comes out clean or with a just a few crumbs attached (if you hit a chocolate chip, try again).

Cool the muffins in the pan for 5 minutes before turning out on a cooling rack. Serve warm or cold.