Insert metal blade in food processor bowl. Add flour, sugar, undissolved yeast and salt; process 5 to 10 seconds to combine. Add butter and egg. Begin processing, then slowly pour warm water through feed tube just until dough forms a ball, about 10 to 15 seconds (all water may not be needed). Continue processing for 60 seconds to knead dough. Carefully remove dough from processor bowl to lightly floured surface. Cover; let rest on floured surface 10 minutes.
Roll dough to 12 ? 7-inch rectangle. Beginning at short end, roll up tightly as for jelly roll. Pinch seam and ends to seal. Place, seam side down, in greased 8 1/2 ? 4 1/2-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 30 minutes or until done. Remove from pan; cool on wire rack.
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