Hazırlanışı
1Gather all ingredients. Preheat the oven to 400 degrees F (200 degrees C). Grease a 2-quart casserole dish with butter.
2Layer 1/2 of the potatoes in the bottom of the prepared casserole dish; season with salt and pepper.
3Layer onion slices over top, then top with with remaining potatoes. Season again with salt and pepper.