Break eggs into mixing bowl, brush pie crust with some of the egg white and set aside. Squeeze moisture out of frozen spinach. Add cream, salt, sugar, spinach and onion to eggs and blend with a whisk until well blended.
Arrange ham in bottom of pie crust, sprinkle with the cheese, and pour egg mixture over cheese.
Bake at 425 degrees F for 20 minutes. Reduce heat to 300 degrees F and bake 30-35 minutes or until knife inserted comes out clean. Let stand 20- 25 minutes before serving.