I originally found this recipe on the internet after doing a search, because I had a tin of Milo that was well past its use-by date and was trying to find ways of using it up. I've changed it slightly since, and these biscuits are worth making even if your Milo isn't a bit old!
Cream together butter and sugar, then add an egg and some Milo. Stir in oats (and some sultanas if you like), then flour to make a slightly crumbly dough.
Make little balls of dough, put on a baking sheet not too close together, and flatten slightly with a fork. Cook for 12-15 mins at 180 C. Leave to cool on tray for a while to become firm before moving to a cooling rack.
125 g butter, soft
1/2 cup caster sugar
1/2 cup Milo
1/4 cup porridge/quick oats
1 1/2 cup self-raising flour
For another way of using Milo in a biscuit, see Oaty Cranberry and Milo Cookies