Preheat oven to 375°F. Grease 9x9 inch baking dish.
Hull and halve strawberries. Quarter if very large.
Mix strawberries with sugar, cornstarch, lemon juice, vanilla, and salt.
Pour into baking dish. Spread evenly.
Mix flour, oats, brown sugar, cinnamon, and salt.
Add cold cubed butter to flour mixture.
Cut butter into dry ingredients until mixture looks like coarse crumbs.
Sprinkle topping evenly over strawberries.
Bake 35 to 40 minutes until topping is golden and filling bubbles.
Cool at least 15 minutes before serving.
Serve warm with ice cream or whipped cream.