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1
In a blender, combine all crepe ingredients and puree on low speed until smooth (scrape down sides of blender, if necessary, and blend again until smooth; do not overblend). Transfer to an airtight container and refrigerate, covered, at least 1 hour.
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2
In a small heavy saucepan over medium-low heat, melt chocolate and cream, stirring, until smooth. Transfer to a small bowl and set aside.
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3
In a bowl, whisk together marshmallow spread and water (start with 1 teaspoon water) until it is easily spreadable. Keep covered at room temperature.
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4
Whisk batter. Brush skillet lightly with additional melted butter and heat over medium heat until hot. Fill a 1/4-cup measure three-quarters full with batter, then lift skillet from heat and pour in batter, tilting and rotating skillet to coat bottom in a thin, even layer. (If batter sets before skillet is coated, reduce heat slightly. Next crepe will be better. If batter is too thick to make a thin creepe, stir in 1 to 2 tablespoons of water.)
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5
Cook crepe until golden around edges and dry in center, about 45 seconds. Loosen crepe from skillet with a heat-proof plastic spatula; with fingertips or spatula, flip crepe over. Cook until underside is golden, about 15 seconds, then slide crepe onto a kitchen towel and fold towel over it.
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6
Make more crepes, brushing pan with additional melted butter occasionally (it's not necessary to brush every time) and stacking them on top of each other in the towel. (You should have about 12 to 14 crepes.)
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7
Preheat broiler.
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8
Put a crepe on a work surface. Spread 1 tablespoon of chocolate filling evenly over crepe. Top with 1 tablespoon marshmallow and spread it evenly. Fold crepe in half, then fold into thirds to form a wedge shape. Fill and fold remaining crepes and arrange on a buttered, large, rimmed sheet pan.
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9
Brush crepes lightly with melted butter, then sift confectioners' sugar over them. Broil crepes about 6 to 7 inches from heat until golden brown, about 1 to 2 minutes.
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10
Transfer to plates and serve with raspberries if you like.
