Step 1

Add noodles, water, salt, and mustard in the Instant Pot, stir to combine.

Step 2

Make sure that the release valve is in the "Sealing" position.

Step 3

Place the lid on the Instant Pot, turn and lock.

Step 4

Press "Manual" button on the Instant Pot on high pressure, and then set the timer to 5 minutes using the "+" or "-" buttons.

Step 5

It will take about 10 minutes for the pot to heat up and build up pressure. You will see some steam release from the lid, and then the time will start on the display.

Step 6

Once cook time is complete, turn off by pressing the “Cancel/Warm” button.

Step 7

Carefully quick-release the pressure by turning the steam release handle on the lid to "Venting" position.

Step 8

Carefully remove the lid, opening the top away from you as steam will be released from the pot.

Step 9

Select "Saute" on the Instant Pot.

Step 10

Add the evaporated milk. Stir occasionally until the sauce has warmed up, about 2 to 3 minutes.

Step 11

Turn off the heat by hitting the “Cancel/Warm” button.

Step 12

Gently stir in cheeses, about a ½ cup at a time, until completely melted and sauce is smooth.

Step 13

Taste and season with more salt and pepper as desired. Serve warm.