1 In a large bowl, using a wooden spoon, quickly stir together ice cream, mashed bananas, California Walnuts and toffee bits until smooth.2 Spread evenly into baked pie crust and freeze immediately until solid, about 4 hours and up to 2 days.3 n a bowl, whip cream until it is light and fluffy.4 Cut banana into 12 slices.5 Spread whipped cream evenly over frozen pie.6 Top with walnut halves and banana slices.