Potato Flour Muffins a La Marshall Field's

I do not know if this is an actual Marshall Field's recipe. The store is gone now and there's no way to find out. Adapted from Women's Day Encyclopedia of Cookery.

• Ready In: 25 mins
• Serves: 12

Ingredients

• 1⁄2 cup potato flour
• 1  teaspoon baking powder
• 1⁄8 teaspoon salt
• 4  eggs, separated
• 1  tablespoon sugar
• 2  tablespoons  ice water

Directions

1. Preheat oven to 375°F.
2. Sift flour and baking powder together and set aside.
3. Add salt to egg whites and beat until stiff, dry peaks form.
4. Beat egg yolks until thick.
5. Beat in sugar.
6. Fold in egg whites.
7. Add flour mixture and mix well.
8. Stir in water.
9. Pour into greased muffin cups.
10. Bake for 15-20 minutes.