Preheat oven to 350. Prepare a 9" pie pan with cooking spray and flour; set aside. To prepare crust, combine graham cracker crumbs and oil in a small mixing bowl. Press into prepared pan. Bake for 10 minutes. To prepare filling, combine vanilla yogurt, malted milk balls, and 1 tablespoon of milk. Spread into prebaked crust. Freeze while preparing top layer. In a mixing bowl, combine malted milk, marshmallow cream, remaining milk, and whipped topping. Spread mixture over layer in crust. Freeze until firm or overnight.