Last week I made Nutella sandwich cookies from a recipe I found on an Italian website. They were delicious. I doubled the batch, and I used the 2nd half of the dough today.
I did 12 with Trader Joe's Cherry Preserves inside (and topped them with an almond sliver) and filled the rest with Nutella. You just can't go wrong with Nutella.
These cookies are delicious warm, but also at room temperature, and they are awesome with coffee.