01 -
Put aside half a cup of each shredded type (except Velveeta/American). Mix up the reserved cheddar, colby jack, gouda, and gruyere in a bowl. Keep this for topping later.
02 -
Set oven to 350°F (177°C). Grease a 23x33x7.5 cm casserole with a bit of butter or cooking spray. Make sure it’s fully coated.
03 -
Fill a big stockpot with 4 liters of water and get it rolling fast on high. Throw in salt, then stir in the macaroni and let it go for 10 minutes till just right. Drain everything well.
04 -
In a bowl, beat the egg with the milk. Add all the spices—seasoned salt, garlic and onion powder, mustard, paprika, pepper, and cayenne. Stir until smooth. Set it aside for now.
05 -
Dump the drained noodles back in the pot, drop in the butter, melt it on medium and stir in the pasta. After that, pour in your spice and milk blend. Give it a good mixing so it’s all coated.
06 -
Toss the big piles of Velveeta, cheddar, gouda, gruyere, and colby jack into the mix. Stir it well. It won’t all melt, and that’s okay.
07 -
Spoon the cheesy macaroni into your greased casserole. Sprinkle all the reserved cheese over the top so it’s covered evenly.
08 -
Lay a piece of foil over the casserole, shiny side in. Spray oil on the inside of the foil or butter it lightly so cheese won’t stick. Bake for 30 minutes in the hot oven.
09 -
Pull off the foil, then bake for another 25 to 30 minutes, uncovered, till it’s golden brown and bubbling. Let it stand for 10 minutes so it’s easier to serve.