Cavatappi (meaning “corkscrew” in Italian) is one of our favorite pasta shapes—it’s springy, chewy, and those tiny ridges hold onto tons of flavor. Plus, it’s just fun to eat. In this comforting pasta bowl, you’ll find earthy sautéed mushrooms and garlicky roasted Brussels sprouts, as well as sweet jammy onions cooked down with red wine vinegar for a tangy-savory-sweet knockout punch. A swirl of butter and sour cream adds richness, and a sprinkle of chives makes a fresh, green finishing touch that takes this easy dinner idea from homey to restaurant-worthy in no time at all.