Ingredients

Instructions

1. 1

   Cook the spinach according to package directions. Squeeze out excess liquid, and reserve. Set the spinach aside.

2. 2

   Melt butter in a large saucepan over medium heat. Add shallots and cook until soft, about 2 minutes. Stir in the garlic, and cook until fragrant, about 1 minute. Add the flour and stir until smooth, but not brown, about 30 seconds. Reduce the heat to medium-low.

3. 3

   While stirring, slowly add the reserved spinach liquid, milk, and Worcestershire sauce. Stir continuously to avoid any lumps. Cook until smooth and thick, about 2 minutes. Add the cheese a handful at a time, and continue to stir until it is melted. Fold in the spinach. Add salt and pepper.

4. 4

   Transfer to a 1 1/2-quart casserole dish.

5. 5

   To serve immediately, preheat the broiler to high. Combine the oil and breadcrumbs in a small bowl. Top the casserole with the breadcrumbs, and broil until golden, about 3 minutes. To serve the following day, preheat the oven to 350°F. Place the casserole dish, covered, in the oven, and heat through, 20 to 25 minutes. Remove from the oven. Combine the oil and breadcrumbs in a small bowl. Top the casserole with the breadcrumbs, and broil until golden, about 3 minutes.