Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
In a large bowl, whisk together the flour, sugar, baking powder, and salt.
In another bowl, combine melted butter, eggs, milk, 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 tin, filling each cup about 2/3 full.
Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Remove from the oven and let the muffins cool in the pan for 5 minutes.
Transfer the muffins to a wire rack to cool completely.
Enjoy your freshly baked chocolate chip muffins!