ooh I have one for you super easy, cheap and makes heaps plus you can add what ever you want to them, I've heard them be called Very Versatile Biscuits before too....I know them as Aunty Ona's bikkies

Sorry I don't have it in metric

6oz butter or margarine
3oz sugar
1/2 tin condensed milk
2C SR flour

just cream the butter and sugar together first (mix them together, lol) add the rest and mix together. roll out until maybe half cm thick, and cut out whatever shapes you want. bake at about 170deg until slightly golden.

instead of using only half a tin of condensed milk I make a double batch and the freeze some unused dough, so next time I just have to pull it out of the freezer and defrost.or you could go nuts, bake them all and then freeze the cooked bikkies. I've added cocoa (for chocolate ones) sprinkles, mini MM's......anything you can think of

if the dough is still a little sticky to roll just keep adding bits of flour until it's easier to roll probably plain flour.

for little kiddies you don't wanna let them brown too much otherwise when they cool and harden they will be too crunchy for them, so just ever so slightly golden....maybe 10-15 minutes??

HTH

ETA the kids LOVE to pick what cookie cutter shapes to use and they love stamping the shapes out. If you don't have anything like that in the house just an upturned glass will cut out a circle shape