"Tender squash in a comforting rich and creamy bake...."
INGREDIENTS
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2 tablespoons butter
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1/2 white onion, thinly sliced
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1 medium zucchini, sliced 1/4-inch thick
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1 medium yellow squash, sliced 1/4-inch thick
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2 cloves garlic, minced
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1 tablespoon fresh thyme leaves
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1/2 cup heavy cream
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1/4 cup Parmesan, grated
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1 cup Gruyere or Swiss cheese, grated
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Kosher salt and freshly ground black pepper, to taste