
Add the macaroni, broth, 2 cups water, butter, ground mustard, and salt to the Instant Pot and stir so the pasta is under the liquid.
Lock the lid and cook on HIGH pressure for 4 minutes, then quick release.
Stir in the milk, then add the cheddar a handful at a time, stirring until creamy.
Stir in the ham and peas, put the lid back on (no pressure) and let it sit 2 minutes to heat through. Add a splash of milk if it gets too thick.
Photo: DinnerDrop