Marshall Field's Frango Mints

Base:
1 cup granulated sugar
1/2 cup butter
4 eggs
16 ounces chocolate syrup
1 teaspoon vanilla extract
1/2 teaspoon salt
1 cup all-purpose flour

Grease and flour a cookie sheet.

Combine in order. Beat well. Spread on prepared cookie sheet. Bake at 350 degrees F for 20 to 25 minutes. Cool completely.

Filling:
2 cups confectioners' sugar
1/2 cup butter
2 tablespoons milk
2 tablespoons peppermint extract
3 drops green food coloring

Beat until smooth and spread across base in pan. Refrigerate until firm.

Topping:
6 ounces chocolate chip morsels (can use a little more)
6 tablespoons butter

Melt in double boiler. Spread on top.