Preheat the oven to 350°C and spray a 9”x 9” glass baking dish with baking spray.
In a large bowl, drizzle the sliced strawberries with lemon juice and toss to combine.
Add the cornstarch to the strawberries and toss to combine.
Marinate the strawberries for 20 minutes.
In a separate large bowl, whisk together the flour, the baking powder, and the kosher salt.
Set the bowl to the side.
In the stand mixer bowl, beat the butter, the brown sugar, and the vanilla until well-blended.
Slowly add the dry ingredients until the mixture resembles little crumbs.
Pour the strawberries mixture into the baking dish. Drop the dough evenly on top of strawberries.
Bake for 30 minutes, or until the top of the cobbler is lightly browned. The filling should be bubbly around the sides.
Serve warm with whipped cream.