How to Make Spinach Souffle Recipe

Cook spinach in boiling water. Drain.

Lightly brown chopped onions in vegetable oil.

Blend in flour.

Slowly stir in milk, and bring to a boil, stirring constantly.

Reduce heat and cook one minute more.

Add spinach, salt, and pepper.

Beat egg yolks slightly, then stir in a little of the hot mixture.

Now, stir in the remaining hot mixture, and cook for one minute more.  

Allow to cool slightly.

In a separate bowl, add cream of tartar to egg whites and beat until stiff.

Fold in spinach mixture.

Pour into a greased 2-quart casserole dish.

Set casserole in a pan of hot water.

Bake at 350° F for about 75 minutes.

Soufflé is done when a knife inserted into the soufflé comes out clean.