Preheat your oven to 350°F. Line a muffin tin with paper liners
In a large bowl, whisk together the flour, cocoa powder, sugar, baking powder, baking soda, and salt
In another bowl, whisk together the milk, vegetable oil, eggs, and vanilla extract. Pour the wet ingredients into the dry ingredients and stir until just combined. Gently fold in the chocolate chips
Spoon the batter into the prepared muffin cups, filling each about 2/3 full
Bake in the preheated oven for 18-22 minutes or until a toothpick inserted into the center comes out clean
Allow the muffins to cool for a few minutes, then transfer them to a wire rack to cool completely
