
Bubbling blueberry filling topped with a golden, crumbly oat and nut crust — this dessert is the kind of thing 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 to thicken everything into a jammy, glossy pool of fruit. The topping layers rolled oats, almond flour, and roughly chopped walnuts with coconut oil and warm spices like cinnamon and ginger, so every bite has serious texture and depth. For anyone navigating a mustard allergy or sensitivity, this recipe is naturally in the clear — every single ingredient is straightforward, and there's nothing here that typically hides mustard derivatives the way spice blends or packaged mixes sometimes do. It bakes low and slow at 350°F until the edges bubble and the topping turns a satisfying shade of golden brown. A ten-minute rest after baking lets the filling thicken just enough so it scoops cleanly rather than running all over the plate. Serve it warm on its own or with a scoop of your favorite ice cream for a dessert that feels genuinely special without much effort at all.
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Learn more →6 servings













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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