40g plain flour (Morrisons Savers, 45p per bag - 1p)
25g butter (Morrisons Savers, £1.08 a pack - 11p)
20g oats (Aldi Everyday Essentials, 75p per bag - 2p
30g sugar - (I used granulated but, if you prefer caster sugar, grind it down a bit first -2p)
Rub the butter into the flour. Stir in the oats and the sugar and mix well.
Use fruit of choice (not priced here), pop into an oven proof container, top with the crumble mixture and bake at about 180 for half an hour or until done.
A proper dessert on 30-30 is, of course, a luxury but an affordable one now and again, especially if one was lucky enough to either be given fruit or to have harvested it from ones garden last summer!
I used little ramekin dishes and the amount above was enough to make three small desserts - one for now, one for tomorrow and one for the freezer!