An apparatus can include an outer housing, a first processing shaft and a second processing shaft. The outer housing can include first, second, and third inlet regions and an outlet. Both processing shafts can be proximate and parallel to each other extending through the outer housing and can be configured to rotate within the outer housing to mix and convey foodstuff materials from the first, second, and third inlet regions to the outlet. The first processing shaft can have a first fluted infeed portion proximate the first inlet region and a first mixing portion extending from the third inlet region to the outlet. The second processing shaft can have a second fluted infeed portion proximate the second inlet region and a second mixing portion extending from the third inlet region to the outlet. At least a portion of the first and second processing shafts can be asymmetric.

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