- Set oven to lowest baking temperature (about 170°F). Line a rimmed baking pan with a silicone baking mat or parchment paper; lightly spray with nonstick cooking spray.
- Purée Berry-Pineapple or Apple-Blueberry Leather ingredients in a food processor on high 1 minute or until smooth; pour into prepared pan and spread to 1/8-inch thick with a spatula.
- Place pan in oven; crack the oven door open and bake 8 hours or until fruit mixture is dry and no longer sticky. Transfer mat with leather to a cutting board; cut into 16 (4½ x 2-inch) pieces. Store leather between parchment paper in an airtight container up to 1 week.