Name: Triple Berry Pie Bars
Ingredients: For the crumb and topping:; 1 cup sugar; 3 cups all-purpose flour; 3/4 teaspoon salt; 1 cup cold unsalted butter (2 sticks), cut into tiny cubes; 1 large egg, at room temperature; For the berries:; (2) 12 oz bags fresh OR frozen berries (I used a medley of raspberries, blueberries, and blackberries); 1/2 cup + 2 tablespoons sugar; 4 tablespoons cornstarch; 2 teaspoons lemon juice; For the Gooey Sour Cream Layer:; 1/4 cup maple syrup; 1/2 cup sour cream; 2 tablespoons pure vanilla extract; 12 tablespoons unsalted butter, at room temperature; 1 cup sugar; 1/4 teaspoon salt; 1 cup + 2 tablespoons all purpose flour