Creamy Crab Casserole with Crispy Crust

Ingredients

• 1 lb lump crab meat, picked over for shells
• 2 tablespoons unsalted butter
• 1 small onion, finely chopped (about 1/2 cup)
• 2 cloves garlic, minced
• 1/4 cup dry white wine (optional but recommended)
• 1/2 cup heavy cream
• 1/2 cup whole milk
• 3 tablespoons unsalted butter
• 3 tablespoons all-purpose flour
• 1 1/4 cups whole milk, warmed
• Salt and freshly ground black pepper, to taste
• 1/4 teaspoon cayenne pepper or smoked paprika (optional)
• 1 cup panko breadcrumbs or fresh breadcrumbs
• 1/2 cup grated Parmesan cheese
• 2 tablespoons unsalted butter, melted
• Fresh parsley, chopped (for garnish)