In a large Dutch oven or heavy pot over medium heat, cook the chopped bacon until crispy, about 5-7 minutes. Remove the bacon with a slotted spoon and set aside, leaving the rendered fat in the pot.

Season the chicken thighs generously with salt and pepper, then place them skin-side down in the hot bacon fat. Sear for 5-6 minutes on each side until the skin is deep golden brown, then remove to a plate.

Add the mushrooms, pearl onions, and carrots to the pot, sautéing for 5-7 minutes until the vegetables begin to soften and brown slightly. Stir in the minced garlic and tomato paste, cooking for another minute until fragrant.

Sprinkle the flour over the vegetables and stir constantly for 1-2 minutes to cook off the raw flour taste. Slowly pour in the red wine while scraping the bottom of the pot to release any browned bits.

Stir in the chicken broth, cooked bacon, and thyme sprigs, then return the browned chicken thighs to the pot, nestling them into the liquid. Bring the mixture to a simmer, reduce heat to low, cover, and cook for 45-50 minutes until the chicken is tender.

Remove the lid and simmer for an additional 10 minutes to allow the sauce to thicken slightly to a glossy consistency. Discard the thyme sprigs, garnish with fresh parsley, and serve hot over mashed potatoes or crusty bread.