SKILLET MACARONI AND BROCCOLI AND MUSHROOMS AND CHEESE

Steps:

• Mix the Cheddar and Parmigiano-Reggiano in a medium bowl. Set aside.
• Melt the butter in a large, high-sided, oven-safe skillet. Add the onion and cook, stirring often, until softened, about 3 minutes.
• Add the mushrooms and cook until they release their liquid and it comes to a simmer, and then reduces by about two-thirds, about 5 minutes.
• Sprinkle the flour over the vegetables in the skillet. Stir well to coat.
• Whisk in the milk in a steady, thin stream until creamy. Then whisk in the mustard, tarragon, salt and pepper. Continue whisking until the mixture starts to bubble and the liquid thickens, about 3 minutes
• Remove the skillet from the heat. Stir in three-quarters of the mixed cheeses until smooth. Then stir in the cooked pasta and broccoli.
• Preheat the broiler after setting the rack 4 to 6 inches from the heat source. Meanwhile, sprinkle the remaining cheese over the ingredients in the skillet. Set the skillet on the rack and broil until light browned and bubbling, about 5 minutes. (If your skillet has a plastic or wooden handle, make sure it sticks outside the oven, out from under the broiler, so the handle doesn't melt.) Cool for 5 to 10 minutes before dishing up.