INGREDIENTS
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1 sheet frozen puff pastry, thawed and cut into six 3-inch rounds
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1 tablespoon extra-virgin olive oil, plus more for muffin pan
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1 large shallot, diced small
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1 pound cremini mushrooms, sliced
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Coarse salt and ground pepper
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2 teaspoons fresh thyme leaves, plus more for serving
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3/4 cup grated Gruyere cheese (2 ounces)