
Warm, bubbling blueberry filling beneath a golden, crumbly oat topping — this is the kind of dessert that makes people hover near the oven waiting for it to come out. The filling comes together with fresh or frozen blueberries, a touch of maple syrup, lemon juice, and arrowroot starch, which thickens everything into a jammy, glossy base as it bakes. The topping layers rolled oats, almond flour, chopped walnuts, coconut oil, and warm spices like cinnamon and ginger into something that crunches and crumbles in all the right ways. Every ingredient here is straightforward and easy to source, so there's no need to scrutinize labels for hidden additives or worry about cross-contact with brazil nuts — a surprisingly common concern with packaged nut-based baking mixes and granola-style toppings. The whole thing bakes at 350°F until the edges are bubbling and the topping taps firm and golden, then rests just long enough for the filling to set into scoopable, spoonable perfection. Serve it as-is or with a generous scoop of your favorite vanilla ice cream for a dessert that feels genuinely special without requiring much effort at all.
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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, combine the blueberries, 2 tbsp maple syrup, arrowroot starch, lemon juice, and 1/2 tsp cinnamon. Toss until the berries are evenly coated, then pour the mixture into the prepared baking dish and spread into an even layer.
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