01 - Preheat the oven to 350°F (175°C). Lightly grease a 2-quart baking dish.
02 - In a large mixing bowl, combine strawberries with granulated sugar, cornstarch, lemon juice, and vanilla extract. Toss gently until strawberries are evenly coated.
03 - Spread the strawberry mixture evenly in the prepared baking dish.
04 - In a separate bowl, combine rolled oats, all-purpose flour, light brown sugar, salt, and ground cinnamon. Add cold butter cubes and use a pastry cutter or fingertips to work butter into dry ingredients until a coarse crumb forms.
05 - Distribute the crisp topping evenly over the strawberries. Bake for 35 minutes until the surface is golden and the filling is bubbling.
06 - Allow to cool for at least 15 minutes before serving. Serve warm, optionally garnished with vanilla ice cream or whipped cream.