
Warm, bubbling apple filling crowned with a golden, crunchy walnut and oat topping — this is the kind of dessert that makes the whole kitchen smell like autumn. Every ingredient here is whole and recognizable: fresh apples, raw walnuts, almond flour, coconut oil, and pure maple syrup, with no synthetic preservatives or artificial additives hiding anywhere in the list. That matters more than it might seem, because BHA and BHT show up in a surprising number of packaged baking mixes, flavored oats, and even some nut products, making store-bought crisps and crumbles a minefield. Building the topping from scratch with gluten-free rolled oats and roughly chopped walnuts keeps everything clean and completely in your control. The maple syrup does double duty — sweetening both the spiced apple filling and the crumbly topping — while cinnamon and a touch of ginger give the whole thing a warmth that feels genuinely homemade. A short rest after baking lets the filling thicken into that perfect jammy texture that scoops beautifully into a bowl. Serve it as-is or with your favorite clean topping, and it's the kind of simple, satisfying dessert you'll come back to all season long.
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Preheat the oven to 350°F (175°C). Lightly grease a 9-inch baking dish with a small amount of coconut oil.
In a large mixing bowl, toss the sliced apples with the lemon juice, 1 tsp cinnamon, ground ginger, and 2 tbsp maple syrup until the apples are evenly coated. Transfer the filling to the prepared baking dish and spread into an even layer.
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