01 - Preheat the oven to 350°F (175°C). 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. Evenly spread the mixture in the prepared baking dish.
03 - In a separate bowl, combine oats, all-purpose flour, light brown sugar, salt, and ground cinnamon. Add the cold, cubed butter and blend using a pastry cutter or your fingers until the mixture forms coarse crumbs.
04 - Distribute the oat topping evenly over the strawberries. Bake in the preheated oven for 35 minutes, or until the topping is golden brown and the filling is bubbling.
05 - Allow the dessert to cool for at least 15 minutes before serving. Serve warm, optionally accompanied by vanilla ice cream or whipped cream.