01 - Preheat oven to 350°F (175°C). Lightly grease a 2-quart baking dish with unsalted butter or nonstick spray.
02 - In a large mixing bowl, gently toss together the strawberries, 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 cubed butter and mix with a pastry cutter or fork until the mixture resembles coarse crumbs.
04 - Distribute the crisp topping evenly over the strawberry mixture. Bake on the center rack for 35 minutes, or until the topping is golden and the fruit is bubbling.
05 - Allow to cool at least 15 minutes before serving. Enjoy warm, optionally topped with vanilla ice cream or whipped cream.