Grease the cocottes or baking dishes with some butter.
Combine the blackberries and apple with the brown sugar, cinnamon, and salt.
In another bowl, mix the granola with the butter.
Divide the blackberry-apple mixture among the cocottes and, if you want to bake them right away, sprinkle with the granola mixture. If you are preparing for the next day, keep the granola mixture separate, cover everything, and store the fruit-filled cocottes in the fridge until you are ready to bake.
Spoon the granola mixture on top of the fruit in the cocottes.
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