Beat eggs, cream, sugar and salt lightly in medium-sized bowl.
Melt butter in 9" skillet over medium high heat, tilting pan to coat bottom and sides. Pour egg mixture into pan. Cook, lifting edges of set mixture to allow uncooked egg to flow to bottom of pan. Continue to cook until omelet is set, but top is slightly moist.
Layer mango over top of omelet and cook 30 seconds. Fold like an envelope and slide onto serving platter.