Beat the butter, powdered sugar, egg, vanilla sugar, salt, and baking powder into a smooth mass.

Add the flour and knead the dough. Gather it into a ball and put it in the fridge for about 30 minutes.

Dust the counter well with flour and roll out the dough to a thickness of 6-7 mm. Cut out circles with a large cutter, then use a shot glass to cut a hole 2-3 cm in diameter in the center of each.

Transfer the rings to a baking sheet and put them in the freezer for 20 minutes so they firm up well.

Meanwhile, prepare the nuts: toast and peel the peanuts, chopping them with a knife if needed. Whisk the egg yolk in a bowl.

Brush the rings with the yolk and coat each one generously with nuts.

Bake the rings for 12-15 minutes in an oven preheated to 190C. Let them cool - and they're ready to eat. Bon appetit!