Prepare the Filling. Preheat your oven to 375°F. In a large bowl, combine the rhubarb, sliced strawberries, granulated sugar, cornstarch, lemon juice, and vanilla extract. Toss to coat the rhubarb evenly.
Prepare the Filling. Preheat your oven to 375°F. In a large bowl, combine the rhubarb, sliced strawberries, granulated sugar, cornstarch, lemon juice, and vanilla extract. Toss to coat the rhubarb evenly.
Assemble the Crisp. Spread the rhubarb mixture evenly in a baking dish. Sprinkle the oat topping evenly over the rhubarb.
Bake. Bake in the preheated oven for 35-40 minutes, or until the topping is golden brown and the filling is bubbling.
Serve. Let the crisp cool for a few minutes before serving. Enjoy warm with a scoop of vanilla ice cream or a dollop of whipped cream.