Preheat the oven to 350 F. Spray the bottom and sides of a 9 x 13-inch casserole dish with butter-flavored cooking spray. Mix the eggs, milk, evaporated milk, salt, and pepper in a medium-sized bowl. Add salt and pepper to taste. Set aside.

Cook pasta according to package instructions, and while it is still hot, add the sliced butter and sour cream.

Mix in the Velveeta, Colby, Monterey Jack, and half of the cheddar cheese into the pasta

Pour the milk/eggs mixture into the bowl with the pasta and cheeses

Scoop the mixture into the prepared casserole dish and top with the remaining cheddar cheese. Bake for 40-45 minutes or until the cheese is melted and slightly brown on top.