Sauté Aromatics: Add sesame oil and Shaoxing rice wine to the Instant Pot. Select the Sauté setting on More/High and allow it to heat for 3 minutes.
Cook Vegetables: Add diced onion and scallions, stirring for 2 minutes until they begin to soften. Add minced garlic and cook for another minute.
Add Chicken & Sauce: Stir in the chicken pieces, cooking until the edges turn pinkish-white (about 1 minute). Pour in the beef broth, hoisin sauce, soy sauce, oyster sauce, and brown sugar. Stir to coat the chicken evenly.
Pressure Cook: Secure the lid and set the valve to the Sealing position. Select Pressure Cook (Manual) on High Pressure and set the timer for 4 minutes. Once done, quick release the pressure.
Steam Broccoli Separately: While the chicken cooks, place broccoli florets in a microwave-safe bowl with ¼ cup water. Cover loosely with plastic wrap and microwave for 3-4 minutes, until tender but still firm.
Prepare Slurry: In a small bowl, mix cornstarch with 2 tablespoons of water to form a slurry.
Thicken Sauce: After pressure cooking, cancel Keep Warm and select Sauté again. Once the sauce bubbles, stir in the cornstarch slurry followed by the steamed broccoli. Let it simmer for 30 seconds until thickened, then turn off the Instant Pot.
Serve & Enjoy: Serve hot with Hibachi Fried Rice, White Rice, or Brown Rice.