01 - Preheat your oven to 375°F (190°C). Line two standard baking sheets with parchment paper to prevent sticking and for easier cleanup.
02 - In a large mixing bowl, thoroughly whisk together the melted butter, granulated sugar, and light brown sugar until the mixture is smooth and well combined. Incorporate the eggs one at a time, beating after each addition, then stir in the whole milk and pure vanilla extract until uniformly blended.
03 - In a separate, medium-sized bowl, whisk together the all-purpose flour, unsweetened cocoa powder, baking powder, baking soda, and salt. Ensure all dry ingredients are evenly distributed.
04 - Gently add the dry ingredients to the wet mixture. Stir just until combined; be careful not to overmix, as this can result in tough muffin tops.
05 - Carefully fold the semisweet chocolate chips into the batter until they are evenly distributed throughout.
06 - Using a large cookie scoop or two spoons, drop 1/4 cup portions of the batter onto the prepared baking sheets, ensuring at least 2 inches of space between each mound to allow for spreading.
07 - Sprinkle additional chocolate chips on top of each batter mound for an appealing finish.
08 - Bake for 10 to 12 minutes, or until the muffin tops are set and firm to the touch at the edges, but the centers remain slightly soft. Avoid overbaking to maintain a moist interior.
09 - Allow the muffin tops to cool on the baking sheets for 5 minutes before carefully transferring them to a wire rack to cool completely. This helps them set and prevents sogginess.