Preheat the oven to 350 degrees F. Line a large baking pan with parchment paper or foil.
Wash and peel the sweet potatoes and slice them very thin circles transferring them to a large bowl.
Once all of the sweet potato slices are in the bowl add 1/4 cup of the olive oil, salt and pepper.
With your hands, mix the oil and seasoning through the slices of sweet potato making sure they get well coated.
Take your metal skewers and begin threading each slice onto the skewer.
Make sure the slices are very close to each other but not quite touching.
Once the skewers are full lay them on the prepared pan and drizzle the remaining olive oil over them.
Mix the melted butter, chives and garlic together.
Brush the sweet potatoes generously with the butter.
Roast the sweet potato skewers in the oven for 1 hour making sure to turn then every 20 minutes and brushing with more butter each time.
Check the sweet potatoes by piercing with a sharp knife, they should be tender.
Transfer the slices from the skewers to a large plate and serve with any leftover garlic butter.