Preheat oven to 450 degrees F. Line a rimmed baking sheet with foil and spray with cooking spray.
Scrub the outside of the potatoes until they are clean, and prick each potato with a fork a few times to allow steam to escape during cooking.
Place potatoes on a microwave-safe plate and microwave 2 at a time for approximately 5-10 minutes, or until tender. Let cool for 5 minutes.
Meanwhile, brown onion and beef in a large skillet over medium heat. Drain and return to skillet. Add the taco seasoning, corn, and refried beans to the meat mixture and stir to combine.
Cut sweet potatoes in half lengthwise. Scoop the inside of the potato out of the peel, leaving a thin layer of potato inside. Set aside the flesh that you just removed and use it for a separate meal, if desired.
Spray the potato skins with cooking spray or rub with olive oil, place on the baking sheet, and bake for about 5-7 minutes (or until outsides are slightly crispy).
Remove potato skins from the oven and stuff with meat mixture. Sprinkle cheese evenly over top.
Turn oven to “broil.” Place the stuffed potatoes under the broiler for 2-3 minutes, or until cheese is melted and potatoes are warmed through.
Garnish with toppings of choice!