01 - Preheat the oven to 350°F (175°C). Lightly grease a 2-quart baking dish and set aside.
02 - In a large mixing bowl, gently toss the strawberries with granulated sugar, cornstarch, lemon juice, and vanilla extract until evenly coated. Transfer the mixture to the prepared baking dish and spread into an even layer.
03 - In a separate bowl, combine rolled oats, all-purpose flour, light brown sugar, salt, and ground cinnamon. Add cold, cubed butter and use a pastry cutter or fork to blend until the mixture forms coarse crumbs.
04 - Evenly sprinkle the oat topping over the strawberry layer. Bake for 35 minutes or until the topping is golden brown and the strawberry filling is bubbling at the edges.
05 - Allow the crisp to cool for at least 15 minutes before serving. Enjoy warm, optionally with a scoop of vanilla ice cream or a dollop of whipped cream.