A terrific make-ahead breakfast strata from baker and pastry chef Zoe Nathan, who uses multigrain bread to add a distinct flavor to this satisfying casserole.
Slideshow:Great Strata Recipes
2 1/2 tablespoons unsalted butter, plus more for greasing
2 pounds butternut squash—peeled, seeded and cut into 1/2-inch dice
1/4 cup plus 1 tablespoon extra-virgin olive oil
Freshly ground black pepper
2 medium onions, thinly sliced, plus 1/2 small onion, finely chopped
3/4 pound kale, ribs discarded and leaves chopped
2 garlic cloves, minced
Pinch of crushed red pepper
2 teaspoons finely chopped thyme
1/4 cup all-purpose flour
2 1/2 cups milk
1 cup heavy cream
1/2 cup crème fraîche
1 teaspoon sugar
8 large eggs
One 3/4-pound multigrain baguette, cut into 1-inch pieces
1/3 cup freshly grated Parmigiano-Reggiano cheese
How to Make It
Preheat the oven to 425° and butter a 9-by-13-inch baking dish. On a rimmed baking sheet, toss the squash with 2 tablespoons of the olive oil and season with salt and pepper. Bake for about 25 minutes, tossing once, until the squash is just tender. Reduce the oven temperature to 325°.
Meanwhile, in a large skillet, heat 2 tablespoons of the oil. Add the sliced onions, season with salt and cook over moderately low heat, stirring occasionally, until golden, about 25 minutes. Scrape the onions into a bowl.
In the same skillet, heat the remaining 1 tablespoon of olive oil until shimmering. Add the kale, garlic, crushed red pepper and 1 teaspoon of the thyme and season with salt. Cook over moderately high heat, tossing, until the kale is wilted and just tender, about 5 minutes. Scrape the kale into the bowl with the cooked onions.
In a medium saucepan, melt the 2 1/2 tablespoons of butter. Add the chopped onion and the remaining 1 teaspoon of thyme and cook over moderately low heat, stirring, until softened, 5 minutes. Add the flour and cook over moderate heat, whisking constantly, until a light golden paste forms, 3 minutes. Whisk in 1 cup of the milk and cook, whisking, until very thick and no floury taste remains, 8 to 10 minutes. Remove from the heat and whisk in the cream, crème fraîche, sugar, 2 teaspoons of salt, 1/2 teaspoon of pepper and the remaining 1 1/2 cups of milk. Let the béchamel cool.
Beat the eggs into the cooled béchamel in the saucepan. Pour into a bowl, add the bread and the vegetables and mix well. Pour the strata mixture into the prepared baking dish and let stand for 30 minutes, pressing down the bread occasionally.
Bake the strata for 55 minutes to 1 hour, until almost set. Increase the oven temperature to 475°. Sprinkle the Parmigiano on the strata and bake for about 10 minutes more, until the top is lightly browned. Let the strata stand for 15 minutes before serving.
The recipe can be prepared through Step 5 and refrigerated overnight.
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