Beat cold butter with sugar until fluffy. Add the eggs one at a time, mixing each time until smooth.
Sift flour with baking powder and cinnamon. Add flour and ground nuts to the butter mixture, knead a fairly thick, but nevertheless pasty dough. Don't overdo the flour! We wrap the finished dough in a film and send it to the refrigerator for at least an hour, you can overnight.
Roll out the dough on a floured board. Don't roll too thin. We cut out 60 circles with molds, in half of them you need to make a hole in the center.
Bake for about 12 minutes at 190 degrees. The edges of the cookies should be browned. We cool the finished cookies on a wire rack, glue them together in pairs with jam and sprinkle with powdered sugar.