Place all of the prepped veggies—from the broccolini to the garlic cloves—into a large mixing bowl. Drizzle them with some olive oil, then add the Italian seasoning, salt, and pepper; toss to coat and set aside.
Pop the Instant Pot onto sauté mode. Add the olive oil and let it warm up for a few minutes, then add in your seasoned veggies. Simmer them, giving them a good stir here and here for about 5-7 min, or until they're tender.
Turn sauté mode off and transfer the veggies back to their original mixing bowl. To keep the veggies warm, cover the bowl with a lid or plate.
Pop the pasta into the Instant Pot and pour the broth on top. Give it a good stir.
Secure the lid onto the Instant Pot in it's locked position; set the valve to "Sealing". Cook the pasta on manual high pressure for 5 minutes, or half the time it states on the package (see recipe notes).
When the timer goes off, hit the quick release on the valve. Open the lid and remove about 1 cup of the starchy broth with a ladle; place it into a small bowl or mug; drain the rest of the broth.
Bring the vegetables back into the Instant Pot and stir it in with the pasta. Add a bit of the broth—you may not use the full reserved cup, but that's ok. You just want to create a bit of a sauce.
Sprinkle some Parmesan cheese into the pasta as well as some chopped basil. Give it another stir.
Transfer the pasta to a serving dish, garnish with some extra Parm and chopped basil, and enjoy!