You can ... but we don't suggest it. Nuts, especially sliced nuts, get really lost in this recipe. They get soft and then are sort of just ... there. They don't add anything to this recipe. Even when they're whole nuts, they just sort of get in the way instead of making the bread any better. Since nuts are so expensive, you really want to use them in a recipe that matters. So leave them out of here (and trust us, you won't miss them).