""I made this up to go with some grilled salmon and boy, it sure turned out a lot better than I expected! A nice twist on the old scalloped potatoes."..."
INGREDIENTS
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2 sweet potatoes, quartered lengthwise
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1 butternut squash, quartered and seeded
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2 tablespoons olive oil, or as needed
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3 tablespoons butter
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1/2 yellow onion, chopped
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2 tablespoons all-purpose flour
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2 cups milk
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1 1/2 teaspoons minced fresh sage, or more to taste
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1 pinch garlic salt, or to taste
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ground black pepper to taste
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1/4 cup grated Asiago cheese