Preheat oven to 350°. Melt butter in a small saucepan over low heat. Remove from heat, and add brown sugar; stir until smooth. Combine all-purpose flour, whole-wheat flour, baking soda, oats, and salt in a medium bowl. Combine butter mixture with the dry ingredients, and add egg and vanilla extract. Fold in walnuts and bittersweet chocolate. Mix well, and spoon by tablespoonfuls onto lightly greased baking sheets. Bake for 12 minutes or until tops are dry to the touch.
Love these and all the neighbors asked for the recipe. I have made four batches this week.I followed the recipe as written.A must have on hand for dinner dessert , kids treats and all around great cookies . A new favorite !!