In a small bowl, toss chicken with 2 tbsp corn starch and mix well until coated.
Place the stainless steel inner pot inside the Instant Pot®. Press Saute and set time to 10 Minutes. Add the olive oil and wait about a minute until it is hot. Add the garlic and stir for 1 Minute, then add the chicken breast cubes and stir until seared on all sides (about 6 Minutes).
Add the well integrated mixture of ketchup, soy and merkén spice mix to the bowl. Put on and lock the lid of the Instant Pot®t. Make sure the steam release handle is turned to Sealing. Press Pressure Cook, pressure level on High, and set the time to 3 Minutes.
When done cooking, press Cancel and then turn the steam release handle to Venting. Once all the steam has been released, open the lid.
Add the mixture of honey and sesame oil and stir well until everything is integrated. Press Saute and set the time to 10 Minutes. Add the mixture of the remaining cornstarch-water mix and stir for about 1 Minute until the mixture thickens. Then press Cancel.