Preheat oven to 350F and spray a square baking dish with oil (I like using coconut oil).
Add dry ingredients to a large mixing bowl. Add in wet ingredients then stir to combine. Fold in any additional mix-ins (berries, dark chocolate, apple chunks, nuts, etc).
Pour batter into baking dish and smooth out with a spatula. Transfer to oven to bake for 30-35 minutes or until top is golden brown.
Allow to briefly cool before serving. I suggest serving with fresh berries and either Greek yogurt, or a side of eggs for a full, balanced breakfast.
Store leftovers covered in the fridge (I personally like it the day after when things have had time to meld together).