In a large bowl, combine oats, rinsed quinoa, sugar, baking powder, cinnamon and salt. Mix well to combine. In a smaller bowl, whisk together coconut milk, egg, vanilla extract and melted butter. Add the wet ingredients to the dry, then spread in a small baking dish or pie plate. (Mine was 9-inch in diameter.) Bake for 30-35 minutes, or until golden on top and set.