Roasted Vegetable Mac 'n' Cheese

Heat the oven to 400 degrees. Slice the tomatoes 1/4 inch thick. Toss the tomatoes and broccoli with the oil and roast separately on parchment-lined baking pans for 30 minutes. Whisk the butter and flour in a medium-size pot over medium-high heat until foamy. Add the milk. Whisk until thickened and bubbling, about 3 minutes. Remove from the heat. Whisk in the cheeses, mustard, salt, pepper, and thyme. Stir in the pasta and broccoli and transfer to a 9- by 13-inch baking dish. Top with the tomatoes and bake about 30 minutes.