Shred the mozzarella, sharp cheddar, and Colby Jack cheeses.
In a pan, melt 3 tablespoons of butter to make a roux. Add half of the seasoning mix.
Stir in 3 tablespoons of flour and cook until the flour is cooked out.
Whisk in a can of evaporated milk, then add 2 cups of heavy cream and the remaining seasoning mix.
Add 1 tablespoon of Dijon mustard and let the sauce thicken.
Gradually add the shredded cheeses to the sauce, allowing each addition to melt before adding more.
Mix the cooked pasta into the cheese sauce until well combined.
Layer the mac and cheese in a baking dish, starting with a small layer, then generously layering the pasta and cheese mixture.
Top the final layer with a generous amount of cheese.
Bake at 350°F for 25-30 minutes, or until the cheese is melted and bubbly.
Garnish with chopped chives before serving. Enjoy your ultimate three-cheese mac and cheese!
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