They are cute! And it's awfully flattering that Kai would think Shinji's capable of making something quite so nice, but, alas.

"Oh, no, I've never tried to do anything like this before." If he did take a stab at chocolate making, it probably wouldn't look so polished. But, now he has to wonder... would he be able to? With what the replicators can make? Hm. "I think the robots cooked these ones up."

You'll notice that there's a spot in that box where one of them has already been taken and, presumably, tested out. No way was he planning on going around and sharing without checking to see if any particularly weird shenanigans were afoot with these treats! Another one is lifted out, and held up toward Kai. Have at it, friend.