Spinach Mac and Cheese Recipe

Ingredients (14)

• Cooking spray
• 1 teaspoon kosher salt plus more for salting the pasta water
• 1 pound small elbow macaroni
• 1/4 cup unsalted butter
• 1 large shallot, minced
• 1/4 cup all-purpose flour
• 4 cups cold milk
• 12 ounces Gruyère cheese, grated
• 1 cup shredded Parmesan, divided
• 1/4 teaspoon freshly grated nutmeg
• 1/8 teaspoon ground cayenne pepper
• 3 (10 ounce) boxes frozen chopped spinach, thawed and squeezed very dry
• 3/4 cup panko breadcrumbs
• 1/4 cup olive oil