Ice cream Cake

My husband's cousin makes this yummy ice cream cake that we just love.  He asked me to make it for his birthday next week. 

Crust:

12 T. butter

4 c. nilla wafers or Oreos (depending on what kind of ice cream you use)

Chocolate sauce:

2 c powdered sugar

1 c. semisweet chips

1 stick butter

1 t. vanilla

12 oz. evap. Milk

Toppings:

nuts

Mix crust. Bake in 9x13 at 350 until golden. Melt sauce ingredients together and boil on low 5-10 min while stirring constantly.

Allow sauce to cool in fridge. When crust is done and cooled, spread ½ gallon ice cream on top. When sauce is cool, spread on top of icecream. Freeze. Sprinkle with nuts if desired.