Preheat the oven to 350 degrees F.
Lightly spray a 13x9 baking dish with cooking spray.
Clean and cut the strawberries and add them to a large bowl.
Add the flour, ¼ cup sugar and vanilla to the strawberries and toss to coat, set aside.
In a medium bowl, whisk together the flour, 1 cup sugar, baking powder and salt.
Cut the butter into pieces and blend it into the flour mixture until small crumbles form.
Gradually add in the milk and stir after each addition until well combined.
Add the strawberries to the prepared baking dish.
Scoop the topping mixture onto the strawberries and spread slightly, mixture will be thick but will spread while baking.
Bake for 40-45 minutes or until golden brown.
Serve warm with vanilla ice cream or whip cream on top.
Store the leftovers in refrigerator.