Add butter, water, salt and macaroni spirals to Instant Pot in that order. Set to cook on high pressure for 2 minutes. Once complete, place a towel overtop of the pressure release valve, then do a quick release of pressure and open the lid when safe to do so.
Stir in milk and white cheddar until fully blended, then add broccoli florets and stir. Replace the lid and let sit 5 minutes. Serve and enjoy! For those who like their broccoli more well done, it can be cooked in a bowl of water for 5 minutes in the microwave, then drained and added to the Mac and cheese.
Add macaroni to a large pot of salted boiling water on the stove. Boil for 8-9 minutes until al dente, then rinse and drain.
Add macaroni back to pot over medium-high heat. Add butter, stirring until melted. Stir in evaporated milk and cheese until creamy and well combined. Finally, stir in broccoli and continuing cooking another 3-4 minutes until broccoli is tender. Serve and enjoy!