Prep: Preheat the oven to 350 degrees and grease a 9x13 baking dish.
Mix: In the baking dish, mix all the ingredients together except for the melted butter, coconut sugar, and half the Greek yogurt. In a small bowl, mix the melted butter and coconut sugar. Dollop this over the top of the baked oats and then swirl it in with a utensil or toothpick.
Bake: Bake for 30-35 minutes or until all the liquid has absorbed.
Enjoy: Let it cool slightly, then cut it into 6 large slices (I know, big, beautiful servings). Enjoy with a dollop of the remaining Greek yogurt (about ¼ cup per slice).