Classic Manicotti Recipe - with Spinach & Cheese

Ingredients

• 14 manicotti shells ((from an 8-oz box))
• 2 large eggs
• 1 (15-oz) container whole-milk ricotta cheese (1¾ cups)
• ⅓ cup mascarpone or cream cheese, (at room temperature)
• 2 cups (8 oz) whole-milk mozzarella cheese, divided
• 1¼ cups (4.5 oz) grated Pecorino Romano, divided
• 1 (10-oz) box frozen spinach, thawed and squeezed very dry
• 2 tablespoons chopped fresh basil
• 2 cloves garlic, (minced)
• 1 teaspoon dried oregano
• ¾ teaspoon salt (plus more for boiling the pasta)
• 2½ cups homemade or good-quality jarred marinara sauce,
• ½ cup heavy cream