For an extra fudgy texture, be mindful not to overbake the brownies. They continue to set as they cool, so aim for a slightly moist toothpick rather than a completely clean one when checking for doneness. Feel free to customize these brownies by adding a scoop of vanilla ice cream or a drizzle of chocolate sauce for a delightful indulgence. Enjoy the rich combination of chocolate chunks and crunchy walnuts in every bite!