Preheat the oven to 325 degrees F. Line a baking sheet with foil. Whisk the egg white in a medium bowl until foamy. Stir in the spice rub and maple syrup. Add the almonds and cashews and toss to coat.
Spread the nut mixture on the prepared baking sheet and sprinkle with a little sugar. Roast until golden brown, stirring halfway through, 30 to 35 minutes. Let cool 15 to 30 minutes. Store in an airtight container for up to a week.