Cookie Dough Brownies

2 c sugar
1 1/2 c flour
1/2 c cocoa
1/2 t salt
1 c vegetable oil
4 eggs
2 t vanilla
1/2 c chopped walnuts (optional)

Filling:
1/2 c butter or margarine, softened
1/4 c sugar
1/2 c brown sugar, packed
2 T milk
1 t vanilla
1 c flour

Glaze:
1 c semi-sweet chocolate chips
1 T shortening
3/4 c chopped walnuts (optional)

In a mixing bowl, combine sugar, flour, cocoa, and salt. Add oil, eggs, and vanilla; beat at medium speed for 3 minutes. Stir in walnuts, if desired. Pour into a greased 13x9 inch baking pan. Bake at 350 for 30 minutes. Cool completely.

For filling, cream butter and sugar in a mixing bowl. Add milk and vanilla; mix well. Beat in flour. Spread over the brownies; chill until firm.

For glaze, melt chocolate chips and shortening in a saucepan, stirring, until smooth. Spread over filling. Immediately sprinkle with nuts, pressing down slightly.