01 - Preheat the oven to 350°F (175°C) and lightly grease a 2-quart baking dish.
02 - In a large mixing bowl, gently toss the strawberries with granulated sugar, cornstarch, lemon juice, and vanilla extract until evenly coated. Spread the mixture evenly in the prepared baking dish.
03 - In a separate bowl, combine rolled oats, all-purpose flour, light brown sugar, salt, and ground cinnamon. Add cold unsalted butter and blend using a pastry cutter or your fingertips until the mixture forms coarse crumbs.
04 - Evenly sprinkle the crisp topping over the strawberry filling. Bake in the center of the oven for 35 minutes, until the topping is golden and the filling is bubbling.
05 - Allow the dessert to cool for at least 15 minutes before serving. Serve warm with vanilla ice cream or whipped cream, if desired.