Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Lightly grease a 12-cup muffin tin or line with paper liners.
Combine flour, baking powder, sugar, and salt in a large bowl.
Stir in milk, egg, butter, and chocolate chips until combined.
Pour batter into the prepared muffin cups.
Bake in the preheated oven until a toothpick inserted into the center of a muffin comes out clean, 15 to 20 minutes.
