Preheat your oven to 375°F (190°C). Line a muffin tin with paper liners.
In a large bowl, whisk together the flour, baking powder, and salt.
In another bowl, mix the melted butter and sugar until well combined. Add the eggs, milk, and vanilla extract, and mix well.
Gradually add the wet ingredients to the dry ingredients, mixing until just combined. Do not overmix.
Fold in the chocolate chips.
Divide the batter evenly among the muffin cups, filling each about ¾ full.
Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Let the muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.