Spinach Lasagna

Ingredients

• 1/4 cup olive oil
• 1 cup medium sweet onion , finely chopped (about 1 cup)
• 1 teaspoon kosher salt , divided
• 1/2 teaspoon black pepper , divided
• 3 (8-ounce) packages fresh baby spinach
• 1 (15-ounce) container whole-milk ricotta cheese
• 1 ounce Parmesan cheese , grated (1 cup)
• 1 large egg , beaten
• 4 tablespoons unsalted butter
• 2 tablespoons minced garlic cloves (from 6 large cloves)
• 1/4 cup all-purpose flour
• 4 cups whole milk
• 8 ounces Gruyère cheese , shredded (about 2 cups)
• 1 teaspoon kosher salt
• 1/8 teaspoon ground nutmeg
• 12 uncooked lasagna noodles
• 1 pound whole-milk mozzarella cheese , shredded (4 cups), divided

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