Cut the chicken fillets in half crosswise once each. Halve the halved fillets again lengthwise. Place each portion between freezer bags and beat flat. Mix with buttermilk in a bowl and chill for about 1 hour.
Wash potatoes thoroughly, cut into slices. Mix in a bowl with oil, salt and 1 teaspoon paprika. Spread on about 2/3 of a baking tray and bake in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see
manufacturer) bake for about 30 minutes.
Remove the fillets from the buttermilk and spread 1 teaspoon of barbecue sauce on each. Cover each fillet with 1 slice of ham, roll it up and pin it with wooden skewers. Turn in breadcrumbs. Heat oil in a high pot, fry rolls in hot fat until golden brown, take them out and let them drip off on kitchen paper.
In the last 10 minutes of cooking time, place the rolls on the tray next to the potatoes and finish cooking. Peel the onions, cut them into thin rings and turn them in flour. Fry the onion rings in hot frying fat until golden brown, remove.
Drain on kitchen paper.
Wash the chives, dab dry and cut into small rolls. Arrange schnitzel rolls with potato wedges and onion rings. Add remaining barbecue sauce and coleslaw. Sprinkle with paprika and chives.