My mum used to make really lovely cake but she has lost the recipe and can't remember how to make it. It was a quite dense plain cake with a crunchie topping that resembled cinnamony sugary bread crumbs. Not sure how the topping was made, or whether it was cooked with the cake or added later. The closest thing it resembles is Steusel topping. Can anyone help with a recipe that might be similar? Thanks.