1. Season the chicken thighs and drumsticks with salt and pepper.

2. In a large pot, mix together the buttermilk, chopped chipotles, and chicken bouillon.

3. Add the seasoned chicken pieces and bring to a boil over medium heat.

4. Reduce the heat, cover, and simmer the chicken for about 45 minutes, until tender.

5. Add the spinach and stir until wilted.

6. Sprinkle the shredded mozzarella cheese over the chicken and let it melt.

7. Serve with rice or bread.