Strawberry Crumble Bars with Soft Shortbread Crust - Zest Plate

Ingredients

• 1 cup (226 g) unsalted butter, room temperature
• 1/2 cup (100 g) granulated sugar
• 1/2 cup (100 g) light brown sugar, packed
• 1 large egg, room temperature
• 2 teaspoons vanilla
• 3 1/4 cups (405 g) all-purpose flour, spooned and leveled
• 3/4 teaspoon baking powder
• 1/4 teaspoon kosher salt
• 2 1/2 heaping cups fresh or frozen strawberries
• 2/3 cup (133 g) granulated sugar
• 2 tablespoons water (omit the water if using frozen strawberries)
• 1 tablespoon cornstarch
• 3/4 cup powdered sugar, sifted
• 4 tablespoons whole milk or heavy cream
• 1/2 teaspoon vanilla, optional