Get that oven fired up to 350, like the desert at noon.
Take a deep 2 1/2 quart baking dish and butter it up, lightly now.
Fill a pot, big as a canyon, with water, and bring 'er to a boil.
Toss in your macaroni and that tablespoon of oil. Cook it for about 7 minutes or so, 'til it's a bit tender.
Drain that macaroni well, and bring it on back to the pot.
Now, melt yourself 8 tablespoons of that butter in a small saucepan, and stir it into the macaroni.
Round up all them shredded cheeses in a large bowl.
Add 1 1/2 cups of the shredded cheese, half-and-half, cubed cheese, eggs, seasoned salt, and pepper to the macaroni. Stir it like you mean it!
Transfer to your buttered-up dish, and top it with the remaining 1/2 cup of shredded cheese.
Dot it with that last tablespoon of butter, 'cause why not?
Bake it up for 30-35 minutes, or until the edges are as golden as a Western sunset and bubbling like a hot spring.
Serve it hot, friends and neighbors. Makes enough for 8, or maybe just one hungry cowboy.