In large bowl, combine 1 1/2 cups flour, potato, sugar, undissolved yeast and salt. Heat water and butter until very warm (120? to 130?F). Gradually add to dry ingredients; beat 2 minutes at medium speed of electric mixer, scraping bowl occasionally. Beat 2 minutes at high speed, scraping bowl occasionally. With spoon, stir in whole wheat flour and enough remaining all-purpose flour to make soft dough.
Knead on lightly floured surface until smooth and elastic, about 6 to 8 minutes. Place in greased bowl, turning to grease top. Cover; let rise in warm, draft-free place until doubled in size, about 30 to 45 minutes. (For Rapid Rise Yeast, cover kneaded dough; let rest 10 minutes.)
Punch down dough; divide in half. Roll each to 12 ? 8-inch oval. Beginning at short end of each, roll up tightly. Pinch seams and ends to seal. Place on greased large baking sheet. Flatten slightly. Cover; let rise in warm, draft-free place until doubled in size, about 20 to 40 minutes.
With sharp knife, cut 3 slashes (1/4 inch deep) on top of each loaf; dust with flour. Bake at 400?F for 25 to 30 minutes or until done. Remove from pan; cool on wire rack. Makes 2 loaves.
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