01 - Preheat oven to 350°F (175°C) and lightly grease a 2-quart baking dish.
02 - Gently toss strawberries with granulated sugar, cornstarch, lemon juice, and vanilla in a large mixing bowl, then spread mixture evenly into the baking dish.
03 - In a separate bowl, combine the rolled oats, flour, brown sugar, salt, and cinnamon. Add cold butter and use a pastry cutter or fork to work the butter into the dry ingredients until coarse crumbs form.
04 - Evenly distribute the crisp topping over the strawberry layer.
05 - Bake for 35 minutes, or until the topping is golden brown and the strawberry filling bubbles at the edges. Allow to cool at least 15 minutes before serving. Serve warm, optionally with vanilla ice cream or whipped cream.