Chocolate Chunk and Walnut Oatmeal Cookies

Preheat the oven to 350 degrees. Melt the butter in a small saucepan over low heat. Remove from the heat and add the brown sugar; stir until smooth. Combine all-purpose flour, wholemeal flour, baking soda, oat flakes, and salt in a medium bowl. Mix the butter mixture with the dry ingredients and add the egg and vanilla extract. Add the walnuts and bittersweet chocolate. Mix well and spread spoon by spoon on lightly oiled baking sheets. Bake for 12 minutes or until the tops are dry to the touch.