Three-Cheese Macaroni

INGREDIENTS

• Kosher salt and freshly ground black pepper
• 1 large egg
• 1/4 cup grated parmesan cheese (1 ounce)
• 1/2 head cauliflower, cut into small florets (4 cups)
• 1/2 cup grated sharp cheddar cheese (2 ounces)
• 1 1/3 cups grated muenster cheese (4 ounces), plus 4 deli-thin slices (1 ounce)
• 1 12-ounce can evaporated whole milk
• 4 cups medium pasta shells (9 ounces)
• Pinch of freshly grated nutmeg
• Pinch of cayenne pepper