Heat oven to 400 degrees F.
Cut cooked sweet potatoes open lengthwise, about 1/3 from the top.
Scoop out inside of potato being careful not to puncture the skin.
Reserve the inside potato.
Cook butter and kale in skillet until kale is wilted through.
Add reserved sweet potato, corned beef, ½ of the green onions, and ½ of the cheese.
Stir and heat through until combined.
Fill sweet potato skins with the meat mixture.
Top each potato with the other half of the cheese and onion.
Place in oven for 15 minutes or until cheese is melted.
Let cool slightly before serving. Enjoy!