You can substitute bone-in chicken thighs, but you’ll need to add a few minutes to the cook time in Step 4: cook until the chicken internal temperature is 165°F when measured at the thickest point.
Use only the ripest peaches. See Notes above on how to ripen peaches. If the peaches are very ripe and sweet, you can omit the brown sugar if desired. Canned peaches work as a substitute.
Any savory herb works well here, like tarragon, oregano, parsley, or rosemary.