In a small bowl, mix together the salt, pepper, thyme, rosemary, and garlic powder.
Sprinkle about ¾ of the seasoning over the chicken thighs and set aside. Save the remaining seasoning for the potatoes.
Heat oil in a large skillet over medium heat. Add the chicken thighs skin-side down and sear until the skin is golden and crisp, about 5–7 minutes. Remove and set aside. (You can sear the other side if you’d like.)
Add the baby potatoes, garlic, chicken broth, and heavy cream to the slow cooker.
Sprinkle over the shredded parmesan and the reserved seasoning.
Place the seared chicken thighs on top in an even layer.
Cover and cook on low for 6–8 hours or high for 3–4 hours, until the chicken is cooked through and the potatoes are fork tender.
Just before serving, top with extra parmesan and chopped parsley.