Heat oven to 200 C/180C fan/gas 6 and line a baking sheet with baking.
Pull pieces off the dough and roll them out to about the thickness of two £1 coins on a floured surface. The easiest way to do this with small children is to roll the mixture out on a baking mat. Cut out shapes using a 9 cm biscuit cutter, or a use the rim of a small glass and peel away the leftover dough around the edges. Press some clean toys gently into the biscuits, making sure you make without going all the way through. Re-roll off-cuts and repeat.
Transfer the whole mat or the individual biscuits to the baking sheet and bake for 8-10 mins or until the edges are just brown. Leave to cool for 5 mins, then serve. Will keep for three days in a biscuit tin.