Preheat oven to 375ºF.

In large bowl, combine 1 cup flour, sugar, undissolved yeast and salt. Heat water and yogurt until very warm (120 to 130ºF); stir into dry ingredients. Stir in egg whites, dried blueberries, dried peaches and enough remaining flour to make soft dough. On lightly floured surface, knead until smooth and elastic, about 4 to 6 minutes. Cover; let rest 10 minutes.

Roll dough to 11 × 7-inch rectangle. Beginning at short end, roll up tightly; pinch seam and ends to seal. Place, seam side down, in greased 8 × 4-inch loaf pan. Cover; let rise in warm, draft-free place until doubled in size, about 30 to 45 minutes.

Bake at 375ºF for 30 to 35 minutes or until done. Remove from pan; cool on wire rack.