Chocolate Mousse

1 1/3cups chocolate chips. Melt in glass container in microwave stirring every 30-35 seconds.
Add:
1/4cup water
2Tablespoons butter
Set aside and cool for 10 minutes.

In saucepan whisk:
3 egg yolks
2Tablespoons sugar
1/4cup water
Cook and stir 1-2 minutes
Remove from heat and whisk in chocolate mix, set saucepan in ice water for 5-10 minutes and stir. Don't let sit too long or the mixture will harden too much.
Fold in 1 1/4 cup Cool Whip.
Refrigerate 4 hours or overnight. Top with Cool Whip.