3. In a large bowl, stir together flour, sugars, baking powder, and salt.
4. In another bowl, stir together milk, eggs, butter, and vanilla until blended.
5. Make a well in centre of dry ingredients.
6. Add milk mixture and stir just to combine.
7. Stir in chocolate chips.
8. Spoon batter into prepared muffin cups.
9. Now bake for 15-20 minutes (reducing the heat to 350°F. (180C) once muffins have risen) or until a cake tester inserted in centre of one muffin comes out clean.