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["Melt the butter in a large saucepan over medium heat.", "Add the mushrooms and cook, stirring often until the mushrooms are browned and most of the liquid has evaporated, about 5 to 7 minutes.", "Add the onions and garlic to the pan and saute until soft and translucent, 3 to 4 minutes.", "Add the flour and cook, stirring with a wooden spoon, to make a light roux, about 2 minutes.", "Whisking constantly, slowly add the milk and continue to cook, stirring occasionally until thickened, 5 minutes.", "Add 1 1/2 teaspoons of the salt, pepper, nutmeg, spinach and 1 1/2 cups of the Parmesan and cook, stirring, until thickened, about 2 minutes.", "Remove from the heat.", "Place a piece of plastic wrap directly on the surface of the bechamel sauce until ready to assemble the lasagna.", "Set a large, 12-inch saute pan over medium heat and add the olive oil.", "Season the chicken with the Essence and remaining 1/2 teaspoon of kosher salt and place in the hot pan.", "Sear the chicken, stirring occasionally, until golden brown and cooked through, about 4 to 5 minutes.", "Transfer to a plate to cool and set aside.", "When cool, cut into bite size pieces.", "Preheat the oven to 375 degrees F.", "Coat a 9 by 13 by 3-inch casserole with olive oil, and spread about 1/2 cup of the bechamel sauce on the bottom of the dish.", "Lay 3 sheets of pasta across the bottom of the dish and spread 3/4 cup of the bechamel sauce over the pasta.", "Sprinkle 1/4 of the chicken over the bechamel sauce, then sprinkle with 1/4 cup of the remaining Parmesan.", "Lay another 3 sheets of pasta over the chicken.", "Repeat 2 additional times with the remaining bechamel sauce, chicken, Parmesan, and pasta, ending with a layer of pasta covered with bechamel sauce.", "Sprinkle the remaining 1/2 cup of Parmesan over the bechamel sauce and scatter the butter pieces over the top.", "Place the casserole on a parchment paper-lined baking sheet and bake, uncovered, until bubbly and well browned, about 45 minutes.", "Remove from the oven and allow to cool for at least 20 minutes before serving.", "Note: You may need slightly less than the entire package of lasagna noodles, depending on the pan used for the casserole.", "Also, you may be able to fit more than 3 pieces of pasta in each layer, depending.", "The pasta can be broken into smaller pieces to fill in the gaps.", "Combine all ingredients thoroughly.", "Yield: 2/3 cup", "Recipe from ""New New Orleans Cooking"
