Preheat oven to 175˚F. Coat a rimmed baking sheet in cooking spray. Set aside.

Place the strawberries and banana in a blender or food processor, and process until smooth. Taste and add the honey or agave if it's too tart. Pour the fruit mixture onto the prepared baking sheet and spread with a spatula to ensure that the fruit is spread evenly.

Bake for about 2 1/2 hours, until the fruit leather is pliable and not wet. Touch it, and if your finger leaves an indentation, it's not quite ready. Fruit varies in water content, so your fruit leather may take a bit more or a bit less time.

Cut into strips using a sharp knife or a pizza cutter. Roll in wax paper and store in a covered container for up to 30 days.