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Preheat an oven to 150 F. Prepare rimmed baking sheets with two silicone mats. Place the frozen mixed berries in a large microwave-safe bowl. Microwave the bowl for one minute or until berries are slightly thawed.
Place berries and collagen in a blender. Blend until very smooth.
Divide the berry mixture between the two silicone mat-lined baking sheets. Place in the preheated oven and bake for at least three and a half hours. You may need to rotate the pan between the racks halfway through the bake time. You will know when your fruit leathers are ready when they are not liquid or stick to your fingers when you touch them. Turn off the oven and allow them to sit overnight.
The next day, move the fruit leathers from the silicone mats and place them on a piece of parchment paper. Roll up the parchment paper in a bit of plastic wrap and cut them into four pieces each. Wrap each one individually in plastic wrap.