Millionaire Squares - cooking recipe

Ingredients

BOTTOM LAYER
1/2 cup butter or 1/2 cup hard margarine
2 cups finely crushed crisp oatmeal cookies (such as Dad's)
FILLING
3 (1 ounce) semi-sweet chocolate baking squares, chopped (1 oz. each, or 1/2 cup chocolate chips)
1/2 cup butter or 1/2 cup hard margarine
1 large egg
2 cups icing sugar (confectioner's sugar)
1/2 cup chopped walnuts (optional)

Preparation

BOTTOM LAYER: Melt margarine in medium saucepan. Remove from heat. Add crushed cookies. Stir well. Reserve 1/4 cup crumb mixture for topping. Press remaining mixture firmly in greased 8 x 8 inch pan. Bake in 350\u00b0F oven for 5 minutes. Let stand in pan on wire rack until cooled completely.
FILLING: Heat chocolate and margarine in heavy medium saucepan on lowest heat, stirring often, until chocolate is almost melted. Do not overheat. Remove from heat. Stir until smooth. Add egg. Beat. Add icing sugar, 2 tablespoons at a time while beating, until smooth, adding more icing sugar as necessary until spreading consistency.
Add walnuts. Stir. Spread evenly over bottom layer. Sprinkle reserved crumb mixture over top. Chill until firm. Cuts into 25 squares.
Company's Coming Most Loved Treats.