Separate whole chicken legs into drumsticks and thighs.
With a cleaver, cut drumsticks into 3 parts. If they are small drumsticks, cut in half.
With a cleaver, cut chicken thighs into quarters.
In the instant pot on the sauté function on medium heat, add cooking oil and brown the chicken pieces in a couple of batches.
Mix in the sauce and the remaining veggies. Make sure that everything is coated in the sauce. Turn the instant pot to the pressure cooker function and set for 10 minutes. Yes, that's right. 10 minutes.
Release the pressure and remove the lid. If you'd like for the sauce to be a little thicker, turn the instant pot to the sautée function on medium heat and cook for another 10 minutes.
Garnish with sesame oil, sesame seeds, and green onion.