Preheat oven to 425 degrees.
Add carrots, parsnips, sweet potatoes, and red onion to a mixing bowl.
Season with olive oil, salt, black pepper, and garlic powder.
Toss until evenly coated.
Spread vegetables on a sheet pan.
Roast for 30 to 40 minutes, flipping halfway through, until tender and golden.
Bake the sweet potatoes until fork tender.
Remove the sweet potato flesh and add it to a mixing bowl.
Add butter, maple syrup, heavy cream, cinnamon, nutmeg, brown sugar, and salt.
Mash or whip until smooth and fluffy.
Season the pork tenderloins with salt, black pepper, garlic powder, onion powder, and fresh rosemary.
Heat an oven safe skillet over medium high heat.
Add olive oil.
Sear the pork on all sides until golden brown.
Transfer the skillet to a 400 degree oven.
Roast until the internal temperature reaches 145 degrees.
Remove from the oven and allow the pork to rest before slicing.
In a saucepan, combine apple cider, brown sugar, Dijon mustard, garlic, and rosemary.
Simmer until reduced and glossy.
Whisk in butter until smooth.
Slice the rested pork tenderloin.
Spoon the apple cider glaze over the top.
Serve with maple whipped sweet potatoes, roasted vegetables, and dinner rolls or biscuits.