Transfer the chopped yellow onion and whole baby gold potatoes to the bottom of your crock pot. Remove the chicken from its packaging and transfer to a large cutting board or large plate. Pat off any excess moisture using paper towels.
Sprinkle both sides of the chicken thighs with sea salt and pepper.
Add the avocado oil to a large cast iron skillet and heat over high heat. Once the skillet is sizzling hot (350 degrees or hotter), add the chicken, skin-side down. Cook for 3-5 minutes, or until the skin is golden brown. Carefully flip the chicken to the other side and cook for another 2-3 minutes (no need to cook the chicken through just yet). You’ll likely need to do this in 2 to 3 batches depending on the size of your skillet and the amount of chicken you use. Transfer browned chicken thighs to a plate to make room for more chicken between batches.
Once all of the chicken has been seared, transfer the chicken to the slow cooker, skin-side up.
In a small bowl, stir together all of the ingredients for the sauce except for the tapioca flour (honey, lemon juice, rice vinegar, soy sauce, pure maple syrup, sriracha, and garlic). Note: you can also use a small blender like a Magic Bullet or NutriBullet to combine the sauce ingredients.
Pour the sauce into the crock pot with the rest of the ingredients and use tongs to move everything around until it appears as though the ingredients are fairly well-distributed.
Cook on High heat for 3 to 4 hours or Low heat for 6 to 8 hours.
If you’d like to thicken the sauce, 1 hour before the chicken has finished cooking, combine 2 tablespoons of tapioca flour, gluten-free flour, or cornstarch with 3 to 4 tablespoons of water until dissolved and pour this mixture into the crock pot and give everything a stir. Cook for 1 additional hour or until the sauce has thickened to your desired level. If you’d like, you can skim the chicken fat off of the surface using a spoon or do as I do and leave it in.
If you love crispy chicken skin, you can transfer the chicken thighs to a large baking sheet using tongs and broil them under the high broil setting in the oven for 5 to 8 minutes or until they reach your desired level of crisp. Note that at this point, the chicken will likely fall from the bone so moving it can be a bit tricky as it will love to fall apart.
Serve chicken and potatoes with sauce spooned over it, and enjoy! I love making steamed white rice or brown rice to soak up some of the delicious sauce.