In a small bowl, mix together the sauce ingredients. Pour sauce in to the slow cooker, wetting all the ingredients. Top with lemon slices.Cook HIGH 3-4 or LOW 6-8.
Sear the chicken a few minutes on each side until browned. Remove chicken from the pressure cooker.
Add onions (and more oil if needed) and cook 3-5 minutes until soft. Add garlic and cook an additional minutes.
Add chicken back into the Instant Pot. Cook on high pressure 10 minutes. Quick release pressure.
Add artichokes. Cook on high pressure 3 minutes. Quick release pressure.
If you use skin-on chicken, when it’s done cooking, place it under the broiler for a few minutes to crisp the skin.
To serve, top the chicken with the artichoke sauce.