Preheat oven to 350. Lightly butter dish (1 9x13 or 2-9x9).
Bring a large pot of salted water to boil. add oil then macaroni, and cook until just tender about 7 minutes. (if freezing it cook pasta a little less time) drain well.
In a large pan melt 8 T butter. stir in pasta. in a large bowl mix the muenster, mild and sharp chedder, and montery cheesese. to the macaroni add the half and half, 1 1/2 cups of the mixed cheese, the velveeta, and the eggs. sprinkle with seasoned salt and pepper. transfer to buttered dishes. sprinkle with remaining cheese and dot with the last tablespoon of butter. bake until its bubbling around the edges, about 35 minutes.
serves 4-6 people as a main dish and 8-10 as a side dish.
***Sometimes I cant find muenster cheese shredded or in a block (only in slices) so i cut it in small pieces.