Water or apple cider in the base: a step that cannot be skipped
Before the lid goes on, half a cup of water or apple cider is poured into the bottom of the slow cooker. This liquid is not incidental — it generates the steam that cooks the apples gently and evenly, and it prevents the sugars from the filling from scorching against the ceramic insert.

Apple cider is the more flavorful choice of the two, reinforcing the apple notes already present in the fruit and adding a subtle depth to the cooking juices that collect at the bottom of the pot. Those juices can be spooned over the finished apples when serving.
The slow cooker format itself is what makes this recipe genuinely low-effort. After 10 minutes of prep — coring the apples, mixing the filling, and placing everything in the pot — the cook can walk away entirely. The appliance handles the rest without any monitoring, stirring, or adjustment.
A buttery oat crumble filling that stays put during cooking
The filling combines the rolled oats, brown sugar, melted butter, and cinnamon into a loose crumble mixture. Packed into the cavity of each cored apple, it absorbs the steam during cooking and transforms into a soft, cohesive topping that contrasts with the tender fruit around it.

The optional additions — nutmeg, maple syrup, or chopped walnuts — each serve a distinct purpose. Nutmeg adds warmth and complexity. Maple syrup introduces a deeper, slightly smoky sweetness. Walnuts bring texture and a mild bitterness that offsets the sugar. Any combination works, and none is required.
Once finished, the baked apples work equally well as a standalone dessert, served with a scoop of vanilla ice cream or a spoonful of whipped cream, or as a simple weeknight treat eaten straight from the slow cooker insert. The recipe is designed to be flexible enough to fit a holiday table or an ordinary Tuesday evening.
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