Super easy peasy recipe and a quick one too – because the mini nature of the crumble.
Get an individual ramekin and set aside. Finely chop a granny apple and season with sugar, lemon, cinnamon and vanilla. Chop enough apple to fill your ramekin(s) three-quarters the way to the top.
To make the crumble rub some room temperature butter with flour and sugar. Quantities will depend on how many you make, but the texture you need is crumbly. Basically the flour, butter, sugar mixture should not be sticky and be like (soft) biscuit crumbs. Fill the rest of the ramekin mixture with the crumbly mixture and bake in the oven until the crumble is browned (but not burnt). Eat with a little ice-cream.