In a small bowl, dissolve yeast in warm water and set aside. In a large bowl mix the water, sugar, 1/4 c butter olive oil, salt, and egg. Add 2 cups of flour and mix until smooth. Add yeast mixture. Mix in remaining flour until dough is easy to handle. Knead dough on lightly floured surface for 5 to 10 minutes. Place in well-greased bowl, cover and let rise until doubled in size, usually 1 to 1 1/2 hours.