Gather all ingredients.
Program Alto Shaam Combi ovens first step to Preheat to 325 degrees.
Pour the milk into the Aluminum pan and add to the Combi while it preheats.
Add butter to the milk as the combi preheats.
Program the second step of the Combi to 284 degrees on combi, at 80% fan speed, 90% humidity for 5:00 minutes.
Add the pasta to the milk mixture.
Then add the Cheese and place back into the Combi.
Program the third step to Combi 480 degrees at 80% fan speed, 90% humidity for 5:00 minutes.
Stir the mixture to blend the ingredients together.
Finally, program the fourth and final step to steam at 212 degrees at a fan speed of 80% for the last 5:00 minutes
Once the Mac and Cheese is complete, wrap and place in the holding cabinet to finish until service.