Season the chicken breasts with oregano and black pepper on both sides.
Set the Instant Pot to "Sauté" mode. Add oil and sear the chicken until browned on both sides. Remove chicken and set aside.
In the same pot, add minced garlic and sauté until fragrant. Add light tomato sauce, light soy sauce, honey, Stevia and chicken broth. Mix well.
Return the seared chicken to the Instant Pot, ensuring each piece is coated in the sauce.
Secure the Instant Pot lid, set to "Pressure Cook" mode, and cook for 8 minutes. Allow for a natural release for about 5 minutes, then carefully perform a quick release to release any remaining pressure.
In a small bowl, mix cornstarch with a bit of water to create a slurry. Stir the slurry into the sauce, then set the Instant Pot back to "Sauté" mode. Cook until the sauce thickens.
Taste and adjust seasoning if necessary. Serve the Instant Pot Honey Garlic Chicken over steamed rice or cauliflower rice. Garnish with chopped chives and toasted sesame seeds.