In a bowl, dissolve yeast in water. Add sugar; let stand for 5 minutes. Add 1/2 cup butter, salt and 2 cups flour; 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 45 minutes.
Punch dough down. Turn onto a lightly floured surface; roll into a 24x10-in. rectangle. Cut dough in half lengthwise, then into 5-in. x 1-in. strips. Twist each strip and place 2 in. apart on greased baking sheets.
Brush strips with remaining butter; sprinkle with garlic salt and Parmesan cheese. Cover and let rise in a warm place until doubled, about 20 minutes.
Bake at 350° for 20 minutes or until golden brown. Remove from pans to wire racks. If desired, serve with marinara or spaghetti sauce for dipping.