Pat dry chicken thighs with a kitchen towel and season both sides with salt and pepper.
Heat oil in an oven proof skillet and place seasoned chicken thighs skin side down. Cook it undisturbed for 2-3 minutes on medium-high heat. Flip and cook for another 2-3 minutes. Remove chicken from the skillet and keep it covered.
To the same skillet, add butter, crushed garlic, shallots, and herbs. Saute for 2 minutes until aromatic.
Add fresh apple cider, chicken stock, dijon mustard, and soy sauce. Mix and let the mixture come to a low boil. Let the mix simmer for 5-8 minutes, and let the mixture reduce to 3/4th.
Place back the seared chicken thighs skin side up and sliced apple in the skillet. place into the oven, uncovered, to braise for 35-40 minutes until the chicken is cooked through and the skin is extra crispy and a deep brown.
Serve on top of mashed potatoes and stir-fried greens.