Mix the first seven ingredients for the dough together very well. Pour the dough into the twelve hollows of a prepared muffin tin (read a tray). Preheat the oven to 180 ° C.
In the meantime, knead the ingredients for the crumbs well and distribute them sparingly (so that it is enough) over the muffins.
Put the muffins in the hot pipe and bake for 20 minutes.