Season the chicken with Italian seasoning, garlic powder, onion powder, paprika, salt, and pepper.
Place the potatoes and carrots in the bottom of the crockpot.
Lay the seasoned chicken on top of the vegetables.
Scatter the minced garlic over the chicken and add the butter slices.
Pour the chicken broth into the crockpot.
Cover and cook on LOW for 6 to 7 hours or HIGH for 3 to 4 hours, until the chicken is tender and the potatoes are cooked through.
Stir in the frozen peas during the last 15 minutes of cooking.
If you'd like a thicker broth, whisk together the cornstarch and cold water, stir it into the crockpot, and cook on HIGH for another 15 minutes.
Sprinkle with fresh parsley and thyme before serving.