In a small bowl combine the crumbs, and the melted butter. Set aside ½ cup, press the remaining crumbs into a 15x10x1 inch baking pan.
Slice the bananas widthwise and layer them over the crust.
Cut the ice cream widthwise into 10 slices, and place them over the bananas.
Spread the edges of ice cream slices to cover the banana, and form a smooth layer. Sprinkle with the nuts, cover and freeze until firm.
In a large saucepan melt the butter, and chocolate chips. Stir until smooth. Pour over the ice cream, and freeze until firm.
In a large bowl whip the cream until stiff peaks form. Spread over the chocolate layer. Top with the reserved crumbs.
Remove from the freezer about 10 minutes before serving.