Blackberry Pie Squares - all-purpose

Method

• For the crust and topping: Preheat the oven to 350 degrees.
• Grease a 9x13-inch baking pan.
• Combine the flour, sugar and salt in a very large bowl.
• Cut butter into the flour mixture using a pastry cutter.
• Continue until the butter is evenly distributed, but the mixture is still crumbly (as you would a pie crust).
• Reserve 1 1/2 cups of the crumb mixture for the topping.
• Press the remaining crumbs into the bottom of the prepared pan.
• Bake the crust for 12-15 minutes, or until it is golden brown.
• Cool for at least 10 minutes.
• To make the filling: Whisk the eggs and sugar together in a large bowl, then add the sour cream, flour and salt.
• Gently fold in the blackberries.
• Spoon the mixture evenly over the crust.
• Sprinkle the reserved crumbs evenly over the top.
• Bake for 45 to 55 minutes, or until the crust is lightly browned.
• Cool for at least 1 hour before cutting into squares/bars.