Preheat oven to 400°F. Grease a muffin tin or line with paper liners. In a large bowl, combine flour, sugar and baking powder. In another small bowl, combine egg, milk, vegetable oil and extract. Add the liquid to the dry ingredients, along with chocolate chunks, stirring until just moistened. Divide batter into 12 muffin cups and bake for 20 minutes or until lightly golden brown.
