Step 1) Combine 1 cup flour, undissolved yeast, sugar, dry milk, and salt in a 1-gallon, resealable heavy duty freezer bag. Squeeze upper part of bag to force out air. Shake and work bag with fingers to blend ingredients. Heat water and oil until very warm (120° to 130°F); add to flour mixture. Reseal bag; mix thoroughly by working bag with fingers. Gradually add enough remaining flour to make a stiff batter that pulls away from the bag. Remove dough from bag; knead on lightly floured surface until smooth and elastic, about 8 to 10 minutes. Cover; let rest 10 minutes.