In a small saucepan, melt eight tablespoons of the butter. Stir into the macaroni. In a large bowl, mix the Muenster, mild and sharp Cheddar, and Monterey Jack cheeses. To the macaroni, add the half-and-half, 2 1/2 cups of the shredded cheese, the cubed Velveeta, and the eggs. Season with salt and pepper. Transfer to the buttered casserole. Sprinkle with the remaining 1 1/2 cup of shredded cheese and dot with the remaining one tablespoon of butter.
04Bake until it's bubbling around the edges, about 35 minutes. Serve hot.