Puffy Potato Doughnuts - cooking recipe

Ingredients

2 c. milk
1/2 c. margarine or butter
1 c. sugar
1 Tbsp. salt
1 pkg. active dry yeast
1 tsp. sugar
1/4 c. lukewarm water
1 tsp. baking powder
1/2 tsp. baking soda
1 c. unseasoned mashed potatoes
3 egg yolks
8 c. sifted flour
cooking oil

Preparation

Scald milk.
Stir in butter, 1 cup sugar and salt.
Cool to lukewarm.
Sprinkle yeast and 1 teaspoon sugar on lukewarm water; stir to dissolve.
Add yeast, baking powder, baking soda, mashed potatoes, egg yolks and 2 cups flour to milk mixture.
Beat with electric mixer at medium speed until smooth, about 2 minutes, scraping bowl.
Or, beat with spoon until batter is smooth. Gradually add remaining flour, blending well.
(Dough will be soft.) Place in lightly greased bowl.
Turn dough over to grease top.
Cover; let rise in warm place until doubled, about 2 hours.