Mac and Cheese with Chicken and Broccoli

INGREDIENTS

• 1/2 bunch fresh chives, chopped
• 1 cup grated Fontina cheese (about 4 ounces)
• 2 tablespoons (1/4 stick) unsalted butter
• Olive oil (for brushing)
• 4 cups whipping cream
• 1 cup grated cheddar cheese (about 4 ounces)
• 2 tablespoons all purpose flour
• 2 heads of broccoli, cut into florets (about 5 cups)
• 1 pound pasta shells, freshly cooked
• 1 pound skinless boneless chicken breasts