Add water, pasta, salt and mustard to the Instant Pot. Stir to combine.
Lock the lid and push the Manual button; adjust timing to 4 minutes. When the cooking time is done, quick release the pressure. See above notes - if it's spewing murky water, lock it again and wait 3-4 minutes. When pressure is released, remove the lid.
Add butter and heavy cream and stir to combine. Add cheese and mix. Gently fold in bacon if using.
Instant Pot Mac and Cheese
Amount Per Serving (0 g)
Calories 444.45Calories from Fat 153
% Daily Value*
Saturated Fat 9.79g61%
Vitamin A 514.77IU10%
* Percent Daily Values are based on a 2000 calorie diet.