01 - Preheat oven to 350°F (175°C). Lightly grease a 2-quart baking dish.
02 - In a large bowl, combine strawberries, granulated sugar, cornstarch, lemon juice, and vanilla extract. Gently toss until well mixed. Spread evenly in the prepared baking dish.
03 - In another bowl, mix oats, all-purpose flour, brown sugar, salt, and cinnamon. Add cold cubed butter, then use a pastry cutter or fingertips to blend until mixture forms coarse crumbs.
04 - Sprinkle the crisp topping evenly over the strawberry filling.
05 - Place dish in oven and bake for 35 minutes or until the topping is golden and the strawberries are bubbling.
06 - Allow to cool for at least 15 minutes before serving. Serve warm, optionally topped with vanilla ice cream or whipped cream.