"Brownie Whoopie Pies - simple brownie cookies filled with a chocolate toffee frosting makes a delicious whoopie pie..."
INGREDIENTS
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For the Brownie Cookies
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1 brownie mix
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1 egg
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1/2 cup butter, melted
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For the Chocolate Frosting
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1/2 cup butter
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1/2 cup marshmallow cream
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1 teaspoon vanilla
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2 Tablespoons whipping cream
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1/2 cup cocoa powder
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2 cups powdered sugar
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1/3 cup toffee bits (optional)