Found this on netmums, which looks nice. Haven’t tried it, but I think I will soon. If you do, let me know how you get on!
150g grated cheese (use less cheese or reduced fat cheese if preferred)
150g porridge oats
All you need to do is mix the ingredients and press into a greased 8 inch/20cm tin. Get your children to join in if they fancy it. Then bake for about 30 to 40 minutes at 180C/Gas 4 until golden brown.
Once it’s cool, cut it into slices.
Variation: add some grated or finely chopped veg.
Suitable for freezing