INGREDIENTS
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3 tablespoons extra-virgin olive oil, plus more for serving
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1 large onion, diced
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1 medium fennel bulb, trimmed and sliced crosswise
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1/2 garlic clove, minced
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2 large fresh sage leaves, roughly chopped
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2 large sweet potatoes (about 1 1/2 pounds), peeled and cubed
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4 cups chicken or vegetable broth
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Kosher salt and freshly ground black pepper to taste
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2 tablespoons grated Parmesan