FIRST LAYER:

1 c. flour
1/2 c. melted butter
1/2 c. chopped pecans

Combine all ingredients and mix thoroughly. Pat into 9"x13" pan. Bake for 15 minutes at moderate temperature. Let cool completely.

SECOND LAYER:

1 (8 oz.) pkg. cream cheese, softened
1 c. Cool Whip
1 c. powdered sugar

Mix all ingredients together and spread on top of first layer. Chill thoroughly.

THIRD LAYER:

2 pkgs. chocolate instant pudding mix
1 tsp. vanilla
3 c. milk

Mix together and beat until thick. Pour over second layer. Chill.

FOURTH LAYER:

Top with additional Cool Whip and sprinkle chopped pecans over the top. Chill again. Sprinkle a grated Hershey bar on top (optional).