This easy, flavorful supper brings great taste and texture to the humble sheet pan. The juicy roasted pork tenderloin has a nice herb coating, and its delicious creamy tarragon mustard sauce is great with the butternut squash and the roasted broccoli florets. The sweet roasted squash balances the savory roasted broccoli, and the meat is perfect with just a schmear of the sauce. Pork tenderloins typically come in packages of two, so freeze one for later or double the recipe for a larger crowd. Make sure to preheat the oven with the rimmed baking sheet inside—this way, the tenderloin gets a nice sear and color before the vegetables hit the baking sheet.