The Best Spinach Lasagna Recipe 

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Recipe Facts
Prep: 20 mins Serves: 8 to 10 servings
Cook: 100 mins
Active: 60 mins
Total: 2 hrs
Ingredients
For the Spinach:
2 tablespoons butter, divided
2 tablespoons extra-virgin olive oil
1 shallot, finely minced (about 1/2 cup)
6 medium garlic cloves, minced (about 2 tablespoons)
Kosher salt and freshly ground black pepper
2 pounds fresh flat or curly spinach leaves, washed and dried
For the Ricotta:
2 pounds fresh ricotta cheese(see notes)
2 large eggs
4 ounces finely grated Parmigiano Reggiano cheese
1 teaspoon freshly grated nutmeg
For the White Sauce:
4 tablespoons butter
1/4 cup flour
1 quart (4 cups) whole milk
12 ounces grated low moisture mozzarella cheese
12 ounces grated Comté, Gruyère, or Emmentaler cheese
For Assembly:
1 1/2 pounds (enough sheets to make 12 layers) fresh lasagna noodles