Reuben Patty Melt Casserole
- For the Thousand Island Béchamel Sauce:
- 1 tablespoon unsalted butter
- 2 tablespoons all-purpose flour
- 1 cup whole milk
- Salt and freshly ground black pepper
- Pinch of freshly grated nutmeg
- 3 tablespoons ketchup
- 2 tablespoons relish
- 5 large eggs
- 1/2 cup heavy cream
- 1/2 cup whole milk
- 1/2 teaspoon salt
- 1 teaspoon dried mustard
- 1/2 teaspoon cayenne
- 1/8 teaspoon freshly grated nutmeg
- 5 tablespoons unsalted butter, divided
- 1/4 pound thinly sliced corned beef, chopped
- 1 1/2 cups sauerkraut, drained
- 8 ounces shredded Swiss cheese
- 2 1-pound loaves thinly sliced rye bread (you need total of 16 slices)
- 1 package pre-cooked patties, halved (you need a total of 12 halves), such as Ball Park Flame-Grilled Patties
For the Thousand Island Béchamel Sauce, melt the butter in a medium saucepan over medium-high heat. Add the flour and cook, stirring occasionally with a wooden spoon, for about 2 minutes; do not allow to brown.
While whisking constantly, add the milk, salt, pepper and nutmeg. Cook the mixture, stirring occasionally, until it comes to a boil. Reduce the heat to medium-low and continue to cook until the sauce has thickened and any floury taste is gone, about 8 minutes.
Remove the sauce from the heat and add the ketchup and relish; transfer to a small heat-resistant bowl. Place a piece of plastic wrap on the surface of the béchamel then set aside and let cool.
In a large mixing bowl, whisk together the eggs, cream, milk, salt, mustard, cayenne and nutmeg. Set the egg-cream mixture aside while you prepare the patty melt casserole.
Grease the bottom and sides of a 9x13” glass baking dish with 1 tablespoon of butter.
In a mixing bowl, combine the cooled thousand island béchamel recipe with the corned beef, sauerkraut and shredded cheese; set aside.
Using a serrated knife, cut the crusts off the bread. Place 8 slices of bread down in the bottome of the casserole dish. Spread half of the béchamel and half of the sauerkraut and corned beef mixture down over the bread. Top with the halved pre-cooked patties. Top with remaining sauerkraut and corned beef, béchamel mixture and 8 slices of bread.
Pour the egg-cream mixture evenly over the top. Top casserole with a piece of parchment or wax paper and place a second casserole dish on top to weigh down the casserole. Refrigerate for at least 1 hour and up to 2 hours. The bread should absorb most of the egg mixture.
Preheat oven to 350°F. Slice remaining 4 tablespoons (1/2 stick) butter into 8 pieces and place one piece on top of each patty melt stack. Bake the casserole, uncovered, until puffed and golden, about 70 minutes. Let casserole cool briefly before serving.
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