Oven 350 degrees. 11″x17″ cookie sheet–this is a big slab pie so feel free to half the recipe and use a smaller cookie sheet.
7-8 C of berries (blueberries, blackberries, raspberries)
1/4 C cornstarch
1 1/4 C sugar
2 T lemon juice
2-3 C crushed frosted flakes
2 boxes (2 per box) of Pillsbury all ready pie crusts OR make your own (enough for 4 crusts)
optional: 1 egg white and about 1 T sugar for dusting, parchment paper