01 - Preheat the oven to 350°F (175°C) and lightly grease a 2-quart baking dish.
02 - In a large mixing bowl, combine strawberries with granulated sugar, cornstarch, lemon juice, and vanilla extract. Toss gently to coat the fruit evenly, then spread the mixture into the prepared baking dish.
03 - In a separate bowl, mix together rolled oats, all-purpose flour, light brown sugar, salt, and ground cinnamon. Incorporate the cold butter pieces, blending with a pastry cutter or your fingertips until the mixture resembles coarse crumbs.
04 - Distribute the oat topping evenly over the strawberry mixture in the baking dish.
05 - Bake for 35 minutes or until the topping turns golden and the strawberry filling bubbles around the edges.
06 - Allow to cool for at least 15 minutes before serving. Serve warm, optionally with vanilla ice cream or whipped cream.