Preheat oven to 350° F. Line a 9x9-inch baking pan with parchment paper and set aside.

In a large bowl, whisk together flour, baking powder and salt. Add the cold butter and use a pastry cutter to create a crumb-like mixture. Alternatively, the mixture can be combined in a food processor pulsing until pea-sized crumbs form, about 20 seconds.

In a separate large bowl, whisk together brown sugar, egg and vanilla until combined. Slowly add the flour mixture to the wet mixture and using a rubber spatula (or your hands!) combine ingredients into a crumbly mixture. Press 2/3 of the mixture into the bottom of prepared dish. Make sure it is compact so it creates a sturdy crust for the strawberries.

In a separate medium bowl, stir together chopped strawberries, sugar and cornstarch. Spoon strawberry mixture over crust. Top with remaining crumble mixture.