Slice and core the jalapeño, then cut into small pieces and place in a bowl. Add the cream cheese and grated cheddar and mix.
Slice the chicken breast fillets horizontally on the side up to the middle and fill with a few tablespoons of the jalapeño cheese mixture. Now turn the chicken breast fillets in the flour, brush with the beaten egg and turn in the breadcrumbs. Then fry them in the pan with a little oil until they are brown on both sides.
Meanwhile, preheat the oven to 180 ° C fan oven. After frying the chicken breast fillets, put them in the hot oven for 20 minutes.