I think this might be the one you're looking for.

Betsy

Mississippi Mud Pie

1 c. flour
1 stick butter
1/4 c. chopped pecans (reserve some for top)

1 c. confectioners sugar
8 oz. cream cheese, softened
16 oz. Cool Whip (reserve half for top)

1 lg. pkg. chocolate instant pudding
3 c. cold milk

Crust: Mix flour, butter and 1/4 cup nuts. Press into 9x13 pan and bake at 350 degrees for 10-15 minutes. Let cool completely.

Filling: Beat together sugar, cream cheese and 1/2 Cool Whip until smooth. Spread over crust. Mix together pudding mix and milk with electric mixer 2 minutes. Let stand a minute to thicken. Pour over cream cheese mixture and spread.

Top with remaining Cool Whip and nuts. Refrigerate.