There's something even better than Nutella (yes, really!) and that's
Marmite. Droooooooool.............. Twiglets are made with Marmite and I daren't buy them as I can't stop until I have finished a pack, but there are also Marmite Biscuits now. They are expensive and hard to find but once you get a box you cannot stop until they are all eaten. I can imagine they would be good with cheese on, but we wouldn't be able to pause from scoffing for long enough to find out.
I also assign Kikkoman's Teriyaki marinade, as this is my new addiction. I used up the whole bottle I got last weekend and am now into withdrawal until I get some more.