Preheat oven to 375 degrees

Grease one dozen muffin cups

In a medium-sized bowl, stir the flour, brown sugar, granulated sugar, baking powder, and salt

In a large bowl, combine the milk, butter, eggs, apple sauce, and vanilla

Gradually add the dry ingredients to the wet ingredients - stir to combine

Fold in the chocolate chips

Spoon the batter into the muffin cups

Bake for about 20 minutes, or until a toothpick inserted into the middle of muffins comes out clean

Cool muffins for 5 minutes

Remove from the tins - use a knife to loosen edges if needed