Preheat your oven to 375F. Grease a 9×9 inch baking dish with butter or a little cooking spray
Mix together ¼ cup sugar, cornstarch, spices, and salt in a small bowl. In a large bowl mix strawberries and rhubarb. Add sugar-spice mixture to the rhubarb and toss to coat. Layer in the prepared baking dish.
Combine brown sugar, oats, flour, hazelnuts, and cinnamon. Pour in melted butter and mix with your hands or a fork until mixture is evenly moistened and crumbly. Sprinkle over the top of the rhubarb.
Place baking dish on a rimmed baking sheet with a bit of parchment paper. (You’ll be glad you did if it bubbles over!). Bake for about 40-45 minutes, or until rhubarb is cooked and topping is a crispy golden. Allow to cool for about 20 minutes before enjoying.
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