Spicy Macaroni and Cheese

INGREDIENTS

• 2 cups elbow pasta, cooked until almost al dente
• 1/2 teaspoons salt
• 1/2 teaspoon freshly ground black pepper
• Special equipment: 2-quart baking dish
• 1/2 teaspoon cayenne pepper
• 1 cup half-and-half
• 1/2 teaspoon dry mustard
• 1/4 cup finely grated onions
• 4 slices bread
• 1 cup heavy cream
• 8 ounces Colby cheese, cubed
• 1/8 teaspoon freshly ground nutmeg
• 4 tablespoons sour cream
• 8 ounces Cheddar, 1/2 cubed, 1/2 shredded
• 1 large egg, beaten
• 1 tablespoon butter
• 2 teaspoons all-purpose flour
• 8 ounces Monterey pepper jack cheese, cubed