Season the chicken thighs with salt, pepper, thyme, and paprika.
Heat a skillet over medium-high heat and sear the chicken thighs skin-side down until golden brown (about 4-5 minutes).
Place chopped onion and minced garlic in the slow cooker.
Add the mixed vegetables to the slow cooker.
Pour chicken broth over the vegetables and onions.
Transfer the seared chicken thighs to the slow cooker, skin-side up.
Cover and cook on low for 6-8 hours or high for 3-4 hours.
Once cooked, check the internal temperature (should be 165°F).
Remove the chicken thighs and let them rest for a few minutes.
Serve garnished with fresh parsley.