Preheat your oven to 350°F. Lightly grease a 9x13-inch baking dish to prevent sticking.
In the greased baking dish, combine the frozen mixed berries, maple syrup, gluten-free flour, lemon zest, and lemon juice. Gently toss everything together to evenly coat the berries.
In a separate bowl, mix the brown sugar, gluten-free flour, oats, cinnamon, and salt. Pour in the melted butter and stir until the mixture is fully incorporated. For extra texture, gently squeeze some of the mixture together to form small clusters.
Evenly sprinkle the oat mixture over the berries, covering them completely. Lightly press the topping down to help it stick together as it bakes.
Place the dish in the preheated oven and bake for 45 minutes, or until the topping is golden brown and the berries are bubbling around the edges.
Remove the crisp from the oven and let it cool for at least 10 minutes. The topping will continue to crisp up as it cools.
Serve warm with a scoop of vanilla ice cream and a sprig of fresh mint for a beautiful, refreshing touch.
Enjoy!
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