01 - Preheat the oven to 350°F (175°C). Lightly grease a 2-quart baking dish.
02 - In a large mixing bowl, gently combine strawberries with granulated sugar, cornstarch, lemon juice, and vanilla extract. Evenly distribute the mixture in the prepared baking dish.
03 - In another bowl, blend old-fashioned rolled oats, all-purpose flour, light brown sugar, salt, and ground cinnamon. Incorporate cold cubed butter using a pastry cutter or your fingers until the texture becomes coarse and crumbly.
04 - Sprinkle the prepared crisp topping evenly over the strawberry layer.
05 - Place in the oven and bake for 35 minutes, or until the top is golden and strawberries are bubbling.
06 - Allow to cool for at least 15 minutes before serving. Enjoy warm, optionally with vanilla ice cream or whipped cream.