Place the puff pastry slices next to each other and defrost. Peel ##onions##, slice or cut into thin rings. Dice bacon finely.
Heat the fat in a frying pan. Fry the bacon in it until crispy and take it out. Fry the onions in the frying fat while turning them approx
Steam for 10 minutes. Fold in the bacon again. Season with ##pepper## and a little salt. Let cool off
Grease 4 small quiche moulds (approx. 15 cm Ø) or 1 large one (30 cm Ø). Roll out the dough slices slightly larger on a little flour. Place them individually in the moulds and press the edges together. Cut off any protruding edges.
Prick several times with a fork.
First spread breadcrumbs, then onion mixture into the moulds. Whisk milk, cream and ##eggs##. Season with salt, pepper and nutmeg. Pour over the onions. Bake in the hot oven on the lowest level (electric oven: 200°C/circulating air: 175°C/gas: level 3) for about 30 minutes.