In a large bowl, combine 2 cups flour, yeast and salt. Add water and oil; beat until smooth. Stir in enough remaining flour to form a soft dough. Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1 hour.
Punch dough down. Turn onto a lightly floured surface; divide in half. Pat each portion flat. Cover and let stand for 10 minutes. Press dough into two greased 12-in. pizza pans. Prick top of dough with a fork. Brush with butter. Combine sugar and cinnamon; sprinkle over dough. Top with nuts. Let stand 10-15 minutes.
Bake at 350° for 25-30 minutes or until lightly browned. Remove from pans to wire racks. Combine confectioners' sugar and enough cream to achieve a glaze consistency; drizzle over warm bread.