01 - Preheat oven to 350°F (175°C) and lightly grease a 2-quart baking dish.
02 - In a large mixing bowl, gently toss strawberries with granulated sugar, cornstarch, lemon juice, and vanilla extract. Distribute evenly in the prepared baking dish.
03 - In a separate bowl, combine rolled oats, all-purpose flour, light brown sugar, salt, and ground cinnamon. Add cold butter and blend using a pastry cutter or fork until mixture forms coarse crumbs.
04 - Sprinkle the oat mixture evenly over the strawberry layer.
05 - Bake for 35 minutes, or until the topping is golden and strawberries are bubbling.
06 - Allow the dessert to cool for at least 15 minutes before serving. For best results, serve warm with vanilla ice cream or whipped cream if desired.