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1
Heat oven to 176°C / 350°F. Butter an ovenproof baking dish.
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2
Spoon warm cuitlacoche filling across the center of each crêpe. Roll and place seam-side down in the prepared dish.
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3
Blend crème fraîche with the 3 whole roasted, peeled poblanos until the sauce is smooth and pale green. Season with salt.
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4
Pour sauce evenly over the crêpes. Cover the dish with foil or a lid.
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5
Bake covered for 10–15 minutes, until the sauce is bubbling around the edges.
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6
Remove cover. Scatter grated cheese over the top and lay the sautéed poblano rajas across the dish.
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7
Return to the oven for just long enough to melt the cheese — watch closely.
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8
Serve immediately.