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