Spinach Souffle - cooking recipe

Ingredients

3 Tbsp. butter
1 Tbsp. finely chopped onion
3 Tbsp. flour
1/2 c. milk and 1/2 c. cream
3 beaten egg yolks
salt and pepper
dash of nutmeg
1/2 c. grated American cheese
1 c. chopped spinach (1 box frozen), drained well
3 egg whites, beaten to peaks

Preparation

Even non-spinach eaters like this one!