This has the savoury hit of a Marmite sarnie without the calories. Just add veg and noodles to Yutaka Japanese Miso Soup or drink on its own.

145 kcals, 4.3g fat per 100g.
89p/90g, Waitrose, Tesco

It's not exactly cool but why deny yourself? If you want a biscuit, make sure it's via the retro route of a McVitie's Fruit Shortcake.

37 kcals, 1.6g fat per biscuit.
75p/250g, widely available