A quick meal with apple and brie.
Preheat the oven to 375F/190C.
Slice pockets into the chicken and stuff with the brie and apple. Dredge in the beaten egg and Panko bread crumbs. Heat the olive oil in a skillet. Brown all sides of the chicken and finish cooking in the oven.
Sauté the mushrooms in the olive oil in the skillet for a few minutes. Add the garlic and rosemary. Cook for a few more minutes. Add the wine and butter. Simmer for a minute or two.
Slice the chicken and spoon the sauce over the chicken and serve.