I’m going to go to Giant this weekend, and see if they still have it.
If they don’t, I’m going to experiment.
All the ‘spinach souffle’ recipes I’ve tried from scratch have had cheese in them; but the Stouffer’s one seemed very light - I never read the ingredients, but it seemed almost just spinach and egg whites in a very light cream sauce...
Yes I would guess egg whites too.
http://www.food.com/recipe/spinach-souffle-46944
You can buy the Spinach Souffle on-line.
https://www.stouffers.com/en/our-dishes/Spinach-Souffle/98#