1 Pre-heat oven to 350°F. Arrange walnuts in a single layer on a large rimmed baking sheet.2 Bake in the centre of oven until fragrant and toasted, about 8 to 10 minutes.3 Let cool. In a large container, combine toasted walnuts with pumpkin seeds, dried cranberries, apricots, banana chips and acai berries (if using). 4 Store in an airtight container for up to 5 days.