…than the wheat and peanut? Answers: (i) TS uses peanut FLOUR as she mills it herself. You can ask her WHY she does that instead of using peanut butter; (ii) TS peels, shreds, dehydrates 20 pounds HOOMAN-GRADE (as a dog would think it) sweet potato, and mills it; (iii) see this video as evidence of TS’ efforts…
And a GIF too!
(iv) when there’s 2 dehydrators running for at least 24 hours, it taxes our off-grid power system (when it’s sunny, the PV panels generate all the kW we need [when it’s cold and rainy, we must rely on our propane powered GENNY-GENERAC]); (v) TS makes these biscuits in small-batches… so there’s no economy of scale (no Purina Dog Chow nor MilkBone [blech] factories); (vi), And that’s why TS must charge a premium for the sweet potato biscuits. TS’ efforts justify the prices for all of the product line for that matter!
By the way: PN has witnessed what the kitchen looks like after a sweet potato milling session. Imagine taking a cooked pumpkin AND a fully dried out gourd, and tossing it into a gasoline-powered turbine-fan. Yeahhhhhhh. IT HITS THE FAN. Cleanup at the rock farm, eh.