01 - Preheat the oven to 375°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup.
02 - Whisk together all-purpose flour, cocoa powder, sugar, baking powder, baking soda, and salt in a large bowl.
03 - In a separate bowl, beat eggs, whole milk, vegetable oil, and vanilla extract until well combined.
04 - Pour wet ingredients into the dry ingredients and stir gently until just combined, avoiding overmixing.
05 - Fold in the semi-sweet chocolate chips, reserving a few to sprinkle on top if desired.
06 - Divide the batter evenly among the muffin cups, filling each about three-quarters full. Top with the reserved chocolate chips.
07 - Bake for 18 to 20 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs.
08 - Let the muffins cool in the pan for 5 minutes before transferring to a wire rack to cool completely.