Crab Macaroni & Cheese Recipe

INGREDIENTS

• 1 package (16 ounces) elbow macaroni
• 6 baby portobello mushrooms
• 2 green onions, sliced
• 1 tablespoon plus 1/4 cup butter, divided
• 1/4 cup King Arthur Unbleached All-Purpose Flour
• 1 teaspoon ground mustard
• 1 teaspoon pepper
• 1/2 teaspoon salt
• 1/4 teaspoon paprika
• 2-1/2 cups half-and-half cream
• 1-1/2 cups (6 ounces) shredded part-skim mozzarella cheese, divided
• 1-1/2 cups (6 ounces) shredded medium cheddar cheese, divided
• TOPPING:
• 1/2 cup panko (Japanese) bread crumbs
• 3 tablespoons butter, melted
• 1 tablespoon dried basil
• 1-1/2 pounds cooked snow crab legs, meat removed
• 4 thin slices Swiss cheese
• 1/4 cup grated Parmesan cheese