Any combination of your favourite can be used for this recipe: macadamia nuts, cashews, brazil, hazelnuts, walnuts, pecans & whole unpeeled almonds).
Please don't be tempted to slot in another job other than melting the butter and stay in eyeshot of the nuts.
Some nuts will take a shorter time to brown and you need to be on hand to quickly remove them from the oven. It is devastating to throw away a tray of nuts, I speak from experience!