Start by cutting the chicken into 8 pieces. Dust each piece of chicken with flour, then season with salt and pepper.
Heat a large shallow casserole dish over medium-high heat, add the olive oil, and sear the chicken until golden brown on both sides.
Add the bacon to the pan and cook for 5 minutes until starting to crisp. Pour in the cognac and let it flame up, then add the bottle of red wine and bring it to a boil.
Add the chicken stock, shallots, rosemary, thyme, and bay leaves. Simmer for 15 minutes until the liquid has reduced by half.
Add the carrots and leeks, then cook for a further 10 minutes until the vegetables are tender. Serve with mashed potatoes or any other side dish of your choice.