Preheat your oven to 450°F (230°C).
In a large resealable bag, combine 2 tablespoons of olive oil, red wine vinegar, minced garlic, and herbs. Season the chicken thighs with salt and pepper, place them in the bag, and massage the mixture into the chicken, ensuring the herbs are evenly distributed. Set aside while preparing the vegetables.
Arrange the sweet potato, Brussels sprouts, apples, and shallots on a large, rimmed baking sheet (18x13 inches). Drizzle with the remaining 2 tablespoons of olive oil, and season with salt and pepper. Toss to coat everything evenly, then spread into a single layer on the pan.
Lay the chicken thighs on top of the vegetable and apple mixture.
Sprinkle the chopped bacon over the entire dish, ensuring the pieces are evenly distributed and not stuck together.
Roast in the preheated oven for 30 to 35 minutes, or until the chicken is cooked through (internal temperature should reach 165°F) and the vegetables are golden brown. For crispier chicken skin, broil for the last few minutes.
If desired, garnish with fresh parsley before serving. Enjoy the dish warm.