Step 1: Preheat the Oven

Preheat your oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners or lightly grease each cup with non-stick spray.

Step 2: Prepare the Wet Ingredients

In a large mixing bowl, whisk together the melted chocolate and butter until smooth. Add the granulated sugar, brown sugar, and vanilla extract, and whisk until fully combined.

Step 3: Add the Eggs

Whisk the eggs into the chocolate mixture, one at a time, until the batter is glossy and thick.

Step 4: Mix the Dry Ingredients

In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt. Gradually fold the dry ingredients into the wet mixture until just combined. Avoid overmixing.

Step 5: Fold in Chocolate Chips

Gently fold in the chocolate chips or chunks to ensure an even distribution throughout the batter.

Step 6: Fill the Muffin Tin

Divide the batter evenly among the prepared muffin cups, filling each about 3/4 full. For a bakery-style look, press a few extra chocolate chips onto the tops of each muffin.

Step 7: Bake

Bake in the preheated oven for 22–25 minutes, or until a toothpick inserted into the center comes out with moist crumbs (not wet batter).

Step 8: Cool and Serve

Allow the muffins to cool in the tin for 5 minutes before transferring them to a wire rack. Serve warm or at room temperature for maximum enjoyment.