Add water, salt to the Instant Pot. Mix well. Then add the dry fettuccini noodles. Most of the pasta should be covered in the water. If it is not, add some more water.
Close the Instant Pot with pressure valve to Sealing. Cook on High Pressure for 4 minutes.
Using fettuccini noodles in this recipe which has 10 minutes for cooking on the stovetop. So to cook on Instant Pot – Divide the cooking time by half and minus one for al dente pasta. So it's 4 minutes. For softer pasta, do 5 minutes.
When the instant pot beeps, Wait 2-3 minutes and then Quick Release the remaining pressure manually. Open the lid, drain if there is any extra water.
Turn on Sauté mode. Stir in the alfredo sauce, black pepper, salt, and steamed broccoli, and mix everything well. Add more alfredo sauce if you want a more creamy texture. Cook for about 3-4 minutes, stirring in between.
When done, garnish with dried or fresh parsley and serve immediately.