In large bowl, combine 1 1/2 cups flour, undissolved yeast, nonfat dry milk, sugar and salt. Heat water and butter until very warm (120? to 130?F); stir into dry ingredients. Stir in egg whites, walnuts and enough remaining flour to make soft dough. Knead on lightly floured surface until smooth and elastic, about 4 to 6 minutes. Cover; let rest on floured surface 10 minutes.
Roll dough to 12 ? 8-inch rectangle. Beginning at short end, roll up tightly. Pinch seam and ends to seal. Place, seam side down, in greased 9 ? 5-inch loaf pan. Cover; let rise in warm, draft-free place until doubled in size, about 30 to 45 minutes.
Bake at 375?F for 35 to 40 minutes or until done. Remove from pan; cool on wire rack.
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