Have all ingredients at room temperature. In mixing bowl, combine sugar, salt, 1 cup bread flour and yeast. Add eggs and butter; mix on medium speed for 3 minutes. Gradually add remaining flour; mix with beater or paddle for 5 to 7 minutes, or by hand, until dough is perfectly smooth, glossy, and elastic. Do not add additional flour. Place dough in bowl. Cover; let rise until doubled and indentation made with finger remains, about 1-3/4 to 2 hours.