Easy Make-Ahead Spinach Gratin

pudgefactor.com

Boyer Homestead

24 ounce package frozen chopped spinach, thawed

2 Tablespoons unsalted butter

2 cups finely chopped onion (1 large onion)

2 Tablespoons all-purpose flour

1 teaspoon Kosher salt

¼ teaspoon freshly ground black pepper

⅛ teaspoon freshly grated nutmeg (See Tip 1)

1 ½ cups milk (See Tip 2)

½ cup (2 ounces) freshly grated Parmesan cheese, divided

½ cup shredded Gruyère cheese

Directions at pudgefactor.com

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