1Cook pasta according to package directions. Meanwhile, cook bacon in a large skillet until crisp; remove bacon, reserving 3 tablespoons drippings in skillet. Coarsely crumble bacon and set aside. Saute onions and mushrooms in drippings for 2 minutes.
2Drain pasta; place in a serving bowl. Stir yolks into hot pasta immediately. Stir in vegetables, bacon, cheese and pepper.