Preheat the Ooni Karu 16 oven to 400°F (I use a combination of lump charcoal & hardwood to maintain the heat and add layers of flavour).
When the oven has reached 375°F, place the Ooni Dual-Sided Grizzler Plate in the oven, ridge side up, to preheat. Pierce potatoes several times.
Once the oven has reached 400°F, place the sweet potatoes on the grizzler plate and bake for 1-1¼ hours or until soft. Rotate the potatoes and change positions every 10 minutes to ensure even cooking. The rear of the oven and sides are slightly hotter, so moving positions will ensure consistent cooking.
As you add fuel, if the flames are too large and are rolling towards the rear potatoes, causing them to burn, open the fuel hatch and allow the flames to burn down, then replace the hatch.
Once the potatoes are done, remove from oven. Set aside until cool enough to handle, then peel off the skin. (Alternatively, cut open and scoop out the pulp). Mash to desired consistency.