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In small saucepan, whisk together sugar, flour, salt, half & half and egg yolks until smooth.
Heat over medium heat until mixture is thickened, about 5 minutes, stirring constantly with a spoon or rubber spatula.
Remove from heat; stir in vanilla and chocolate. Continue stirring until chocolate is melted. Cool quickly. Fill cupcake.
To prevent a skin from forming, brush surface with melted butter. Stir before using.