INGREDIENTS
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1 3-pound spaghetti squash, halved lengthwise and seeded
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1 tablespoon olive oil
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1 15-ounce container ricotta
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1 large egg
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4 cups baby spinach, chopped
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1 garlic clove, chopped
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1/8 teaspoon ground nutmeg
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kosher salt and black pepper
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2 cups grated mozzarella (1/2 pound)