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["Preheat oven to 350F with rack positioned in upper and lower thirds of oven.", "Line 2 large baking sheets wirh parchment paper.", "In a large bowl, gradually whisk milk into cocoa.", "In another bowl, mix together flour, baking powder, baking soda and salt.", "In a large bowl, using an electric mixer beat sugar and butter until fluffy; beat in egg and vanilla.", "Using a wooden spoon, stir in flour mixture alternately with milk mixture, making 3 additions of flour and 2 of milk, until blended.", "Drop 2 slightly heaping tablespoons batter into 8 mounds onto 1 baking sheet, at least 3-inches apart, make 8 more on the second.", "Bake, switching pans on racks halfway, for about 15 minutes or until tops spring back when touched.", "Let cool on pan for 2 minutes.", "Transfer to rack to cool completely.", "Repeat to make 8 more , reusing 1 sheet; bake on middle rack.", "FILLING: In a small saucepan, sprinkle gelain over milk; let stand 5 minutes.", "Heat over medium-low heat, stirring for 1 minute until gelatin is dissolved.", "Pour into a bowl; stir in sugar and vanilla and let cool to room temperarture.", "In a chilled bowl, using an electric mixer, whip cream until almost stiff peaks; gradually beat in milk mixture.", "Cover and refrigerate for about 30 minutes until set or for 1 day.", "To assemble, spread the flat side of half of the cakes with filling.", "Sandwich with remaining cakes.", "VARIATION: To make Vanilla Whoopie Pies, omit cocoa powder and increase flour ro 2 1/4 cups, increase vanilla to 2 teaspoons and add 1 teaspoons vinegar or lemon juice with milk.", "VARIATION: Fold 1/2 cup mashed raspberries and 1 tablespoons extra icing sugar into the filling before chilling.", "Can also decorate with sprinkles when the ""pies "" are assemble, the sprinkles will go on the icing."]
