https://www.lowesmarket.com/Recipes/Detail/1558/Squash_Souffle
Yield: Serves 4
Steam onion and squash together until tender. Drain excess water and mash well. Add crushed crackers, salt, pepper, butter, 2 beaten egg yokes and cheese. Blend well. Fold in 2 stiffly beaten egg whites. Pour into greased baking dish and bake at 350 degrees about 45 minutes or until set and slightly brown.
Please note that some ingredients and brands may not be available in every store.
https://www.lowesmarket.com/Recipes/Detail/1558/Squash_Souffle