Using a sharp, narrow knife, remove the stem and seeds from the apples.
In a separate bowl, combine the brown sugar, cinnamon, and walnuts/pecans.
Fill each apple with the brown sugar mixture. Top it off with 1/2 tbsp of butter.
Place the apples in a baking dish. Pour the water into the bottom of the pan. Bake at 350°F for about 40 minutes or until the apples are tender. Enjoy!