In a bowl, add all the sauce ingredients. Whisk until evenly combined. Taste and adjust as needed.
Add the noodles to the instant pot (break spaghetti in half).
Pour the above sauce into the pot above the noodles. Add vegetables on top except broccoli. Seal your Instant Pot and set to manual, high pressure, 4 minutes. When Instant Pot is done cooking, do a quick pressure release.
Open the lid and add the broccoli florets. Stir the noodles with tongs several times, breaking up any that may have clumped together during cooking. Add salt and black pepper to taste. Close the lid for 5 minute so the broccoli get cooked.
Open the lid. Sprinkle some green onions and sesame seeds and serve.