Combine the rhubarb, strawberries, sugar, cornstarch, and vanilla extract in a large bowl. Toss gently until the fruit is well coated. Transfer the mixture to the prepared baking dish and spread it out evenly.
In a separate bowl, combine the flour, rolled oats, brown sugar, cinnamon, and salt for the topping. Mix well to combine. Add the cold butter pieces to the bowl and use your fingers or a pastry cutter to cut the butter into the dry ingredients until the mixture resembles coarse crumbs.
Sprinkle the topping evenly over the fruit mixture in the baking dish.
Place the baking dish in the preheated oven and bake for about 40-45 minutes, or until the topping is golden brown and the fruit is bubbling.
Remove the crisp from the oven and let it cool for a few minutes before serving. You can serve it warm or at room temperature.
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