01 - Preheat oven to 350°F. Lightly grease a baking dish.
02 - Core the apples without piercing the bottoms to create cavities for the filling.
03 - Combine rolled oats, chopped walnuts, maple syrup, cinnamon, nutmeg, and sea salt in a bowl; stir thoroughly.
04 - Fill each apple cavity evenly with the oat mixture, pressing gently to pack.
05 - Place stuffed apples into the prepared baking dish. Pour approximately 1/4 cup water into the dish to prevent sticking.
06 - Cover loosely with foil and bake for 25 minutes. Remove foil and continue baking for 10 minutes until apples are tender and tops are golden brown.
07 - Whisk tahini, maple syrup, vanilla extract, salt, and warm water together until smooth and pourable.
08 - Remove apples from oven, allow to cool slightly, then drizzle generously with tahini sauce before serving.