Put all the ingredients for the dough in a bowl and stir with a wooden spoon (not with the mixer!) But it is very easy. Roll out the dough and top it with any fruit (plums, apples).
Tip: Before topping with plums, spread some cake pudding on the dough. Before topping with apples, add a little applesauce to the dough.
Put all the ingredients for the crumble in a bowl and knead into crumble with the dough hook or by hand. Then distribute on the fruit.