In a large mixing bowl, combine all the ingredients excluding the berries and mix well until it smoothens.
Spray a square 8-inch dish with coconut oil and pour the mixture into it.
Spread the berries on top but put it gently so as not to spill the mixture. Bake at 320°F for 30 minutes or wait until the center is thoroughly cooked.
Remove from the oven and let it cool before cutting into 12 squares. Place the cut pieces on a dish and serve them upside down.