1.Lightly spray the inside of the slow cooker with cooking spray.
2.Place the potatoes in the slow cooker.
3.Whisk together the melted butter, olive oil, garlic, Parmesan, Italian seasoning, salt, and pepper in a small bowl.
4.Pour the mixture over the potatoes and toss to coat them evenly.
5.Cover and cook on high for 3 to 4 hours or on low for 5 to 6 hours until the potatoes are tender.
6.Sprinkle additional Parmesan cheese and fresh parsley on top before serving.