01 - Preheat oven to 350°F. Lightly grease an 8-inch square baking dish with coconut oil.
02 - In a large mixing bowl, thoroughly combine rolled oats, shredded coconut, nuts if using, coconut sugar, baking powder, and salt.
03 - In a separate bowl, whisk together coconut milk, eggs, melted coconut oil, and vanilla extract until smooth and well combined.
04 - Pour wet mixture into dry ingredients and mix until ingredients are fully hydrated.
05 - Spread half of oat mixture evenly into the prepared baking dish. Arrange half of the berries over the surface.
06 - Layer remaining oat mixture on top, followed by the rest of the berries.
07 - In a small bowl, mix shredded coconut with coconut sugar. Distribute mixture evenly over the top layer.
08 - Transfer baking dish to oven and bake for 35 to 40 minutes, until golden and center is firm and springy.
09 - Allow to cool at least 10 minutes before slicing. Serve warm or at room temperature.