Blackberry Pie Bars

55m 

Produce

3 cups: Blackberries

1 tsp: Lemon

Refrigerated

1: Egg

Breakfast foods

1/2 cup: Cornflakes cereal

Baking & spices

2 1/2 cups: All-purpose flour

2 1/2 tbsp: Cornstarch

1/2 cup: Powdered sugar

1 tsp: Salt

1/2 cup: Shortening

2/3 cup: Sugar

1/2 tsp: Vanilla

Dairy

1/2 cup: Butter, unsalted

2/3 cup: Milk

1 tbsp: Water or milk