01 -
Using a box grater, grate sharp cheddar, Colby jack, Gouda, and mozzarella by hand. Set aside the smallest cheese pieces to add later for extra gooey pockets.
02 -
Bring a large pot of water to a boil and add chicken bouillon powder. Cook pasta according to package directions until just shy of al dente. Drain and set aside.
03 -
In a heavy-bottomed saucepan over low heat, melt butter. Slowly whisk in cold heavy cream, ensuring a smooth mixture without simmering.
04 -
Gradually add half of the grated cheese to the warm cream sauce, stirring gently until mostly melted. If using, fold in cream cheese and mix until velvety smooth. Season with salt, onion powder, ground mustard, white pepper, and adobo. Adjust seasoning to taste.
05 -
Fold drained pasta and reserved cheese bits into the sauce, stirring carefully to fully coat noodles with a slightly loose, creamy texture.
06 -
Butter a 9x9-inch baking dish. Spoon half of the cheesy pasta mixture into the dish, sprinkle half of the remaining cheese on top, then repeat layering with the remaining pasta and cheese for an even golden crust.
07 -
Bake uncovered at 350°F (175°C) for 25 minutes until bubbly. Switch to broil for 2 minutes to achieve a golden, crispy top, watching closely to prevent burning.