01 -
Pat the chicken dry using paper towels. Carefully cut a horizontal pocket in each breast, stopping just before cutting all the way through. Sprinkle salt and pepper inside and out of the chicken.
02 -
Place slices of brie into each pocket, followed by 3-4 apple slices. You can use toothpicks to hold them together if you like.
03 -
Heat up butter and olive oil together in a skillet over medium-high heat. Cook the chicken on each side until it has a nice golden crust, about 2 minutes per side. Take the chicken out, keep it covered.
04 -
Turn the heat to medium. Toss in the onion slices, cooking them for 2-3 minutes until soft. Add the rest of the apple slices, sprinkle with salt, and cook for another 2 minutes until they start to brown a bit.
05 -
Pour in the wine to loosen up the flavorful bits stuck on the pan's bottom. Let it reduce by half.
06 -
Sprinkle the flour across the pan, mixing it well so there are no lumps. Pour in the chicken broth, maple syrup, vinegar, mustard, and rosemary. Once it starts boiling, lower the heat and let it gently cook for 5 minutes. Adjust salt as needed.
07 -
Return the chicken, along with any juices, back into the pan. Cover with a lid and let it simmer on low heat until completely cooked through, about 8-10 minutes, or until the chicken's internal temperature reaches 165°F. Take out the rosemary before serving.