Baked Spinach Casserole

Ingredients

  • 2 tablespoons unsalted butter

  • ½ cup diced shallots

  • ¼ teaspoon salt

  • 32 ounces frozen spinach

  • 2 tablespoons all-purpose flour

  • 1 cup whole milk

  • ¾ cup grated Gruyere

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