Preheat the oven to 350 degrees F (175 degrees C). Spray a 9x13-inch baking dish with cooking spray.
Bring a large pot of water to a boil. Add macaroni and 2 ½ teaspoons salt and cook, stirring frequently, for 5 to 6 minutes. Drain and set aside.
Shred Cheddar cheese by hand or in a food processor; set aside.
Melt butter in a large saucepan over medium heat. Whisk in flour and cook, whisking constantly, until smooth, 3 to 4 minutes. Whisk in mustard powder, then 3 ½ cups milk. Whisk occasionally until mixture comes to a simmer, then let simmer for 5 minutes.
Add cream cheese and cook, stirring often, until thick, creamy, and smooth, about 5 minutes. Add remaining 1 ½ teaspoon salt, pepper, and cayenne.
Stir in 2 cups shredded Cheddar. Turn off the heat and let cheese melt. Stir in cooked macaroni. Add up to ¼ cup milk if you feel like the mixture is too thick.
Layer ½ of the pasta mixture in the bottom of the prepared baking dish. Top with 1 ½ cups Cheddar. Spread remaining pasta mixture over top and sprinkle with remaining Cheddar.
Bake in the preheated oven until golden and bubbly, 25 to 30 minutes.
Nutritional Facts
Per 10 servings
Calories: 505
Carbohydrate: 41g
Fat: 28g
Fiber: 2g
Protein: 21g
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