Preheat oven to 425 degrees. Unfold pie crust and place layer of crust in a casserole dish. Mix remaining ingredients except butter, and pour into dish. Dot mixture with butter and cover with top crust. Sprinkle with a little sugar on top. Bake for 10 minutes and reduce heat to 350 degrees. Bake for 20-25 minutes until crust is golden brown.