Sheet Pan Spinach Lasagna

Ingredients

• 1 Tbsp. extra-virgin olive oil
• 1 lb. hot Italian sausage, casings removed
• 1 medium onion, finely chopped
• 6 garlic cloves, 2 finely chopped, 4 whole
• 1 1-lb. bag frozen spinach
• 1 lemon
• 3 cups whole milk
• 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt
• ½ tsp. freshly ground pepper
• 8 oz. low-moisture mozzarella, coarsely grated (about 2 cups)
• 8 oz. Parmesan, finely grated (about 4 cups)
• 1 cup heavy cream
• 1 lb. fresh lasagna sheets

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