A rotary sizing apparatus to form granola pieces includes a transfer device to move a granola slab and a diversion portion extending along a transfer axis between a receiving end and an exit end for receiving the slab from the transfer device. A rotary breaking device is disposed adjacent and in spaced relationship to the exit end for receiving the granola slab. The rotary breaking device is rotatable about a rotary breaking axis disposed above the transfer axis, and includes at least one blade for rotatably striking the top side of the moving granola slab to break the granola slab into a plurality of granola pieces. The at least one blade engages the top side of the granola slab during rotation of the blade to establish a breaking angle between zero and forty five degrees relative to the top side of the granola slab.
