Preheat the oven to 375ºF. In a large bowl, whisk together the apple sauce, egg, brown sugar, hemp sweetener, vanilla, cinnamon, nutmeg, salt, baking powder, and melted cannabis butter. Once whisked smooth, add the milk and whisk until smooth again.
Add the raisins and dry rolled oats. Stir with a spoon until the mixture is combined. Line a 9x9 casserole dish, then pour the oat mixture into the dish.
Bake the oatmeal uncovered in the fully preheated oven for 45 minutes. Baked oatmeal is good warm or cold and tastes great with cold milk poured over top. Maple syrup and fresh berries always taste great sprinkled on top.