3 tbsp. butter
3 tbsp. flour
1/3 tbsp. salt
4 eggs, separated
1 c. milk
1 c. cooked, chopped spinach
1/2 c. grated cheese

Make white sauce with butter, flour and milk. Put some of hot mixture with beaten egg yolks. Then add all of it. Add cooked spinach and cool. Cut in stiffly beaten egg whites. Pour in deep greased casserole and bake for 1 hour and 20 minutes at 300 degrees. A "collar" can be shaped around the top of the casserole and held together with scotch tape before baking.