Preheat your oven to 350°F (175°C).
Line a muffin tin with paper liners or grease it lightly.
In a large bowl, whisk together the dry ingredients: flour, sugar, cocoa powder, baking powder, baking soda, and salt.
In another bowl, combine the wet ingredients: oil, eggs, vanilla extract, and milk.
Pour the wet ingredients into the dry ingredients, and stir gently until just combined.
Fold in the chocolate chips gently, reserving a few for topping.
Spoon the batter evenly into the prepared muffin tin, filling each liner about 2/3 full.
Sprinkle the reserved chocolate chips on top for an extra touch.
Bake in the preheated oven for 18-22 minutes, or until a toothpick comes out clean.
Let the muffins cool in the pan for a few minutes before transferring them to a wire rack.
Enjoy your chocolate muffins warm, or store them in an airtight container for later.