Season chicken thighs with salt and pepper. Heat oil in a large dutch oven. Place chicken skin side down. Cook until cooked through, turning once. Remove from pan and set aside.
Add vegetables and cook until softened. Add in garlic, bay leaf and thyme. Add chicken stock and bring to a simmer.
Remove skin from chicken and debone. Shred chicken and return to the soup.
Season soup to taste with salt and pepper and add lemon juice.
Cook pappardelle pasta separately until al dente, then add to soup.