Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.
In a large bowl, gently toss the prepared strawberries with granulated sugar, cornstarch, lemon juice, and vanilla extract until evenly coated. Pour the strawberry mixture into the prepared baking dish.
In a separate medium bowl, whisk together the flour, brown sugar, cinnamon, and salt for the crumble topping.
Add the cold, cubed butter to the dry ingredients. Using a pastry blender, your fingertips, or two forks, cut the butter into the flour mixture until it resembles coarse crumbs with some pea-sized pieces of butter remaining.
Evenly sprinkle the crumble topping over the strawberry filling in the baking dish.
Bake for 35-45 minutes, or until the topping is golden brown and the strawberry filling is bubbling around the edges.
Let the crumble cool for at least 15-20 minutes before serving to allow the filling to set slightly.