Very easily could be a bug as there's a few little oddities in the whole thing I couldn't quite pin down. The inventory window up top is disallowed so you can concentrate on what's before you on the prep table. The way it's supposed to work is click on the mixing bowl of potatoes, click on the cast iron. If that's not working then I'm really not sure what the answer is except maybe starting over and hoping hoping that the next try is more successful. Not a great answer but that's game jams, I guess!
At any rate, thanks for the kind words!!
I'm not exactly sure what's going on here but I suspect it has something to do with the "peeled potatoes" being in your inventory. There are several tools in your inventory that peel potatoes so I think maybe one of them is wrong. Using the potatoes on the Y-Peeler (which Jobie claims to hate!) will work. Or that using the mandoline on the peeled potatoes removes the potatoes from your inventory which would also make this happen, I think. Luckily, you can actually skip the mandoline step completely! There are also still debug controls in the game so if that doesn't work "ctrl-s" will give you every inventory item which may also work. Plus, that would give you a look at some cut content and other weird and broken stuff!
EDIT: I think actually doing the thing you are instructed in-game to do is the problem. Don't shave the potatoes. (What a weird sentence)