Preheat oven to 175 degrees. Coat a rimmed baking sheet with cooking spray.
Add all ingredients to food processor or blender and process until smooth. For seedless fruit leather, strain mixture through sieve. (I happen to love raspberry seeds!)
Spread fruit evenly (this is really important!) onto baking sheet. Bake until fruit leather is dry, but still flexible. This is about 5 hours in my oven, but the cook time can vary, so keep an eye on your fruit leather as it cooks. Allow to cool and cut into strips using a pizza cutter or kitchen shears. Wrap each piece in wax paper and store in an airtight container or zip-top bag.
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