Preheat oven to 400 degrees F. Lightly grease a large non-stick baking sheet with sides.
Add the potatoes to a large mixing bowl and toss with olive oil and melted butter.
In a small bowl mix together all the spices including salt and pepper. Sprinkle over potatoes and toss well.
Spread out on baking sheet and roast until tender and golden about 25-35 minutes depending on how well done you like them. Serve immediately garnished with sour cream if desired.