Cutting sweet potatoes into 1-inch chunks or cubes is a great way to prepare them for roasting. They turn out crispy on the outside, but still substanial and creamy on the inside. First, peel the sweet potato. Trim the top and bottom, then cut the spuds into round slices. Cut each slice into 1-inch cubes or chunks. Remember that cutting them as evenly and close in size as possible will enusre they all cook in the same amount of time.