Wash the chicken fillets, pat them dry well and season with salt and pepper. Whisk the egg. Turn fillets first in flour, then in the egg and finally in breadcrumbs.
Heat the oil in a pan. Fry the meat for 3-4 minutes on each side until golden brown. Remove from the pan.
Drain the pineapple well. Cut the bread roll open and brush with butter. Cover lower halves with ham, escalopes, pineapple and cheese. Bake in a hot oven (electric cooker: 220 °C/circulating air: 200 °C/gas: level 4) for approx. 3 minutes until the cheese has melted.
Take out and place the top halves of the rolls on top.