Small square cake or slice tin 20 x 20 cm / 8 in x 8 in lined with baking paper
Break up the cookies in a food processor or by putting into a plastic bag and hitting with a rolling pin
Mix the melted butter and crumbs together and press into a lines cake tin. Chill till firm
Mix the gelatine powder with 1/2 cup (125 ml / 4.22fl oz) boiling water. Stir to dissolve then add the can of condensed milk and the vanilla. Mix till combined. Pour over the chilled base and return to the fridge. Set for an hour or till firm
Put 2 x 9 gm of jelly crystals into a bowl with 250 ml ( 1 cup / 4.85 fl oz) boiling water. stir well. Add another 250 ml / 1 cup/ 4.85 fl oz of water and stir till combined. Cool in the fridge till cold BUT NOT SET.
Put the eyeballs onto the white condensed milk layer spaced out in lines. Spoon over enough jelly so that the base of the eye are just covered. You won’t need it all.