Caramelized banana mousse

1. Melt butter in nonstick frying pan. Add brown sugar and bananas.
2. Sautei bananas until they are well coated and soft.
3. Remove from heat and let cool a few minutes.
4. Add yogurt and puree with bananas in blender.
5. Beat egg yolks and 1/3 cup sugar in stainless stell bowl over hot water bath or top half of double boiler until mixture lightens in color and becomes fluffy (about 2 minutes).
6. Add gelatin that has been softened in orange juice to egg mixture and continue beating for another 2 minutes.
7. Remove mixture from heat and combine with banana puree, mixing thoroughly.
8. Refrigerate for 10 minutes.
9. Meanwhile, whip cream and 3 tbsp sugar into soft peaks.
10. Beat egg whites until they form firm peaks.
11. Foldi 2/3 of the whipped cream (reserving 1/3 for garnish) into the chilled banana puree.
12. Fold in egg whites.
13. Chill for 4-6 hours.
14. Top with remaining whipped cream and chipped walnuts.
15. Serve 6-8.