INGREDIENTS
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3 tablespoons butter
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1 yellow onion, diced
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2 cloves garlic, minced
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1 (2 1/2 pound) butternut squash - peeled, seeded, and cut into 3/4-inch chunks
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1 teaspoon brown sugar
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1 cup chicken broth
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8 ounces shredded Gruyere cheese
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8 ounces shredded extra-sharp Cheddar cheese
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1 cup dry bread crumbs
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1 tablespoon chopped fresh thyme
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1 tablespoon chopped fresh rosemary
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1/4 cup grated Parmesan cheese