To a large pot, heat the oil over medium-high heat. Pat dry the chicken thighs and add a pinch of salt and pepper to both sides of the thighs. Carefully place the thighs into the pot and cook each side until browned.

Remove the chicken thighs from the pot and temporarily set aside on a plate. Add the apple wedges to the pot and sauté for a few minutes until golden and caramelized. Place the apple wedges on a separate plate.

Turn down the heat to medium. To the pot, add the onions and brandy. Use a wooden spoon to scrape up the browned bits that are stuck to the bottom of the pan. After a few minutes, when the onion has softened, add the garlic and cook for another minute.

Add the chicken back into the pot and pour in enough apple cider so that the chicken is mostly immersed in the cider, but not completely submerged. Raise the heat to high to bring the cider to a boil. Once it's boiling, turn down the heat to medium and cover the pot with a lid; cook for 5-7 minutes, until the chicken is tender and cooked through.

Remove the lid from the pot and stir in the cooked apples, mustard, cream, and chopped sage. Allow the mixture to simmer for about 5 to 7 minutes longer, until the sauce has reduced and thickened.

Serve each chicken thigh with a few apple wedges and some cream sauce poured over it. Enjoy immediately with French bread.