INGREDIENTS
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For the cookies:
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6 oz. (1-1/3 cups) all-purpose flour
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2 oz. (2/3 cup) cake flour
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1/2 tsp. baking soda
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1/4 tsp. salt
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6 oz. (12 Tbs.) unsalted butter, completely softened at room temperature
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3/4 cup smooth peanut butter
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1/2 cup sugar
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1/2 cup firmly packed light brown sugar
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1 tsp. pure vanilla extract
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1 large egg
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For the filling:
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1-1/2 cups confectioners' sugar
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3 oz. (6 Tbs.) unsalted butter, softened at room temperature
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3/4 cup smooth peanut butter
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3 Tbs. heavy cream
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1/4 cup coarsely chopped roasted unsalted peanuts
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1/4 cup coarsely chopped semisweet chocolate, or mini semisweet chocolate chips