[header] How to make ham yam pizza [title] Preheat oven per the instructions with your pizza crusts (probably around 425f [220c] ). [title] Open the can of yams and empty the yams into a dish. [step] If you drain the yams, reserve the liquid. 
[title] Mash the yams with the potato masher or a sturdy fork. [step] If you drained the yams, add the reserved liquid as necessary to keep the mashed yams from being too much like a paste.