Smoked Sausage Alfredo Skillet Dinner

0 Preheat the broiler.
1 Cook the pasta [timer minutes=0]10 minutes[/timer] in salted boiling water to cover, or as directed on package.
2 Drain.
3 Meanwhile melt the butter in a heavy, 12-inch iron skillet.
4 Add the chopped onion and saute about[timer minutes=0] 3 minutes[/timer].
5 Add the sausage and continue to saute, stirring often, about [timer minutes=0]2 more minutes[/timer] or until the onion is golden and soft.
6 Stir in the drained pasta and the Alfredo Sauce.
7 Sprinkle with Mozzarella.
8 Place under the broiler for [timer minutes=0]3 to 5 minutes[/timer], or until the top is golden brown and the cheese is melted and gooey.
9 Serve immediately.