Preheat oven to 425F. Coat a large cast iron skillet with oil/ghee or line a baking sheet with parchment paper.
Wash and chop potatoes and onion into 1/2" cubes.
Spread evenly in the skillet/baking sheet and season with sea salt, black pepper, and garlic powder.
Bake for 15 minutes. Mix well with a spatula and bake for another 15 minutes.
For crispier potatoes, leave under the broiler for 3-5 minutes after baking.
Serve with eggs and bacon!