Parmesan Potato Wedges

2 lbs red potatoes cut into wedges
1/4 c finely copped yellow onions
1 1/2 tsp dried oregano
1/2 tsp salt
black pepper to taste
2 tbsp butter cut into 1/8 in pieces
1/4 c grated parmesan cheese

Layer potatoes, onion, oregano, salt paper and butter in crock pot. Cover and cook on high 4 hrs. Transfer to serving platter and sprinkle with cheese.