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In a small saucepan, combine chocolate and butter. Cook over low heat until both have melted.
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Stir until smooth and set aside.
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In a small bowl, combine flour, baking powder, and salt. Set aside.
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In a mixing bowl, beat together the eggs, sugar, and vanilla until mixture begins to thicken.
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Stir in cooled chocolate mixture, followed by flour mixture.
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Beat until combined. Let batter stand 10 minutes in order to thicken up.
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Preheat oven to 375 degrees.
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Drop dough by tablespoon onto a lined baking sheet, keeping each cookie about 2 inches apart.
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Bake for 8 minutes, or until edges are set and cookies are slightly cracked.
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Let cool for 1 minute before removing to a cooling rack.
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Prepare the frosting. In a mixer bowl, combine butter and peanut butter, beating until smooth.
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Slowly mix in powdered sugar one cup at a time, mixing well after each addition.
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Add in vanilla and cream and beat until frosting is spreadable consistency, adding more cream if necessary.
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Stir in mini chocolate chips.
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To assemble, pipe or spread a generous spoonful of frosting over the bottoms of 6 cookies.
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Top each with remaining cookies.