Creamed Spinach Casserole

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3 tablespoons unsalted butter

2 cloves garlic, minced 

1 small onion, finely chopped 

1 1/4 cups heavy cream 

1/4 teaspoon freshly grated nutmeg 

1/8 teaspoon cayenne 

Two 10-ounce packages frozen chopped spinach, thawed and squeezed dry 

Kosher salt and freshly ground black pepper 

1/2 cup grated Parmesan 

2 ounces cream cheese 

2 tablespoons panko breadcrumbs