Select saute or browning setting on a 6-qt. electric pressure cooker. Adjust for medium heat; add 1 tablespoon sesame oil. When oil is hot, brown chicken in batches using additional oil as necessary. Press cancel. Return all to pressure cooker. In a bowl, whisk honey, soy sauce, water, garlic and pepper flakes; stir into pressure cooker. Lock lid; close pressure-release valve. Adjust to pressure-cook on high for 4 minutes. , Quick-release pressure. In a small bowl, mix cornstarch and water until smooth; stir into pressure cooker. Select saute setting and adjust for low heat. Simmer, stirring constantly, until thickened, 1-2 minutes. Serve with rice. Sprinkle with sesame seeds and, if desired, green onions.