Preheat the oven to 350°F / 175°C.
Spray a 7-inch x 11-inch baking pan with non-stick cooking spray and set aside.
In a medium bowl, mix the oats, brown sugar, salt, coconut and cinnamon together.
Spread half of the oat mixture evenly into the prepared dish.
Layer half of the blackberries over the oats, then top that with the remaining oats mixture and the rest of the berries.
Slightly shake the pan to settle the ingredients.
Using bowl previously for the oats mixture, combine the egg, melted coconut oil, vanilla extract, and milk (make sure the milk is not cold, or the coconut oil will seize and the warm milk, makes your oatmeal more custardy).
Mix until everything is well combined, then pour the milk mixture over the oat and blackberry mixture.
Bake for 40 – 50 minutes or until the oats set and golden brown. Yum!
Microwave or eat cold for leftovers.