The Crunchiest Crispy Tuna and Green Bean Casserole Recipe - Beard and Bonnet

Ingredients

• 1 (16 ounces) package ziti pasta
• 1 (12 ounces) can solid white tuna in spring water, drained
• 1 (8 ounces) package haricots verts (thin green beans), cut into 1-inch pieces
• 3 cups heavy cream
• 2 cups (8 ounces) shredded sharp white Cheddar cheese
• 6 tablespoons butter, divided
• 6 tablespoons grated Parmesan cheese, divided
• 2 tablespoons butter, melted
• 2 medium leeks, thinly sliced
• 2 (4 ounces) packages fresh gourmet mushroom blend
• ¼ cup all-purpose flour
• 1 cup organic vegetable broth
• 2 tablespoons chopped fresh chives
• 1 tablespoon chopped fresh tarragon or parsley
• ¾ teaspoon kosher salt
• ½ teaspoon freshly ground black pepper
• Vegetable cooking spray
• ¼ cup crushed potato chips
• ¼ cup panko (Japanese breadcrumbs)
• Garnish: sliced fresh chives