Season chicken thighs with salt and pepper.
Sear chicken thighs in olive oil until golden brown (2-3 minutes per side). Transfer to a plate.
Sauté carrots, celery, bell pepper, and onion in olive oil and butter for 10-12 minutes. Add garlic for 1-2 minutes.
Deglaze with white wine, scraping up brown bits, and cook until mostly evaporated (1-2 minutes).
Stir in flour for one minute, then gradually add chicken stock and dried herbs. Bring to a simmer.
Return chicken to the pot, cover, and simmer for 20 minutes, flipping halfway. Shred chicken and set aside.
Add potatoes to the pot, cover, and simmer for 20-30 minutes until tender. Stir in shredded chicken, season, and serve.