INGREDIENTS
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Butter, for greasing the pans
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Kosher salt
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1/2 box spaghetti (about 8 ounces)
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2 packed cups spinach leaves, finely chopped
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1/4 cup grated Parmesan
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2 tablespoons extra-virgin olive oil
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1/3 cup grated Parmesan
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2 tablespoons whole milk
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3/4 teaspoon kosher salt
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1 large egg
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Olive oil, for drizzling
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2 cups marinara sauce, warmed
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12 small fresh mozzarella balls, such as ciliegine or bocconcini
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Special equipment: Four 4-inch-diameter springform pans