Wash and dry the potatoes and cut them into quarters (cut small potatoes in half and large potatoes in 6-8 pieces).
Add the potatoes to a large casserole dish, along with the olive oil, garlic powder, parsley, and grated Parmesan.
Toss all the ingredients together in the casserole dish and smooth the top of the mixture.
Bake at 400 degrees Fahrenheit for about 20-25 minutes, or until the potatoes have crisped up on the outside and you can spear them easily with a fork.
Serve immediately.
Notes
These potatoes keep in an airtight container in the fridge for up to two days after they've been roasted. They're great for re-heating for leftovers!