Harriett's Yummy (my all time favorite dessert)

Harriett's yummy

crush 1 box of vanilla wafers
add 6 T. melted butter
add 2 T. sugar

mix well and press into 9 x 13 pan (reserve about 1/2 cup for top)
freeze while preparing next layer

melt together'1/2 cup butter and
2 1 oz. squares unsweetened chocolate
add 1/4 cup milk, mix well
add 1 1/2 cups powdered sugar
mix well and
add 1/2 carton of THAWED 8 oz. cool whip

place on top of crumbs and freeze

cut 1/2 gallon of mint chocolate chip ice cream into 3/4 inch slices and lay on top of chocolate layer, fill in cracks

sprinkle the reserved crumbs on top

freeze