Luisa, someone gave me a local bakery's sourdough crisps, with walnut and cranberries
The bakery makes a wonderful walnut and dried cranberry sourdough bread.
It looks like they take the day old leftovers, slice them about 1/8" thick, maybe brush it with olive oil, sprinkle it with cinnamon sugar, then bake it until it's hard and crunchy. It looks like a biscotti, and I'm sooo loving it!
Might be a good use for your leftovers too, if you needed another use for your walnut breads....