Kingfisher, here's a pie my daughter makes that is so delicious you'd never know how guilt-free it is. Instead of the fat-free Jello and Cool-Whip, you can use sugar-free.
I have also made it with all the fattening stuff.
Double Chocolate Pudding Pie
1-1/2 cups cold skim milk; divided
1 package Jello chocolate pudding mix; fat free
1 package Jello white choc pudding mx; fat free
1 tub Cool Whip; fat free
1 graham cracker crust (8 or 9 in)
Pour 3/4 cup milk into a medium bowl. Add chocolate pudding mix and beat on low for 1 minute. Stir in 1/2 of Cool Whip. Spoon evenly into crust. Pour remaining milk into another bowl. Add white chocolate pudding mix and beat 1 minute. Stir in remaining Cool Whip. Spread over chocolate layer. Refrigerate 4 hours, until set.