Nicole's French Onion Mac and Cheese

Heat 2 tablespoons butter and olive oil in a large skillet over medium heat. Add onions and cook, stirring constantly, for 1 minute. Reduce heat to medium-low and cook, stirring occasionally, until golden brown, about 40 minutes.

Add thyme, Worcestershire, and sherry and cook until most of the liquid has evaporated, about 3 minutes. Season with 1/2 teaspoon salt and 1/2 teaspoon pepper. Remove onions from the pan and set aside. Reserve skillet.

Bring a large pot of water to a boil and add 2 teaspoons salt. Add pasta and cook until tender, about 6 minutes. Drain and set aside.