Preheat the oven to 350 degrees F.
Spray 9x13 baking dish with baking spray.
In a large bowl, combine the strawberries, rhubarb, sugar, vanilla, and cornstarch and stir to combine.
Spread the filling mixture into the prepared baking dish.
In a medium bowl, combine the flour, oats, brown sugar, cinnamon, and salt, and whisk to combine.
Pour in the melted butter and stir with a spatula to combine, until the ingredients are well incorporated.
Sprinkle the crisp topping on top of the filling.
Bake in the preheated oven for 35-40 minutes, until the top is golden brown and the filling is bubbling. Let cool for 10 minutes.
Serve topped with vanilla cream. Enjoy!