04Turn the popcorn out onto the baking sheets, spreading into an even layer. Bake the popcorn for one hour, stirring and tossing every 20 minutes. Move the bottom tray to the upper rack and vice versa each time you stir. The popcorn will deepen in color and harden a bit as the caramel bakes and sets. Cool the popcorn to room temperature. Store in an airtight container. I’ve found the popcorn will keep, stored tightly, for 1-2 weeks.