Be aware: butter sometimes spurts out when releasing the pressure.I have had two readers over the years have this happen before so wanted to warn you. If you are nervous that this will happen, stir the butter into the dry pasta and tuck it under the pasta to help stop this. I have made this mac and cheese about 50 times at least and I had this happen slightly once. Keep a towel handy!
Many pasta shapes should work for thisInstant PotMac and Cheese.I have used regular shell pasta and whole wheat. Elbow macaroni, rotini, penne, and so much more. I have not tested with a gluten free pasta to date.
You can use water instead of broth if needed.I think the broth adds more flavor and richness but if you decide to use water that will work just fine.
Adjust the milk to make your mac and cheese more or less saucy.Not everyone loves a super saucy macaroni and cheese. That is fine. Start with 1/2 cup of milk and then add more as desired for a creamier, saucier texture.