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To make the cookies: In a large bowl, whisk together the contents of the cookie mix packet and the cocoa.
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Add the butter, egg, and vanilla; beat until thoroughly combined. This will take 2 to 3 minutes in a stand mixer fitted with the flat beater attachment.
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Divide the dough in half and place one piece on a sheet of parchment. Place another sheet of parchment on top.
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Roll the soft dough between the sheets of parchment until it's 1/4” thick. Put the dough, sandwiched between the parchment, on a baking sheet. Repeat with the remaining dough. Refrigerate the rolled-out dough for 2 hours.
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To make the filling: Place the freeze-dried fruit and 1 cup (113g) of the confectioners’ sugar in the bowl of a food processor and process until the fruit is finely ground and powdery.
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Add the remaining confectioners’ sugar, cream cheese, and butter and process until the mixture is uniform.
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Add the milk and process until you have a stiff but spreadable filling.
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Preheat the oven to 350°F.
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To cut the cookies: Remove one piece of dough from the refrigerator. Peel off the top piece of parchment and use it to line a baking sheet.
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Using a 2” round cutter, cut out cookies and transfer to the prepared baking sheet. Gather, re-roll, and cut the scraps as needed.
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Repeat with the remaining piece of dough.
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To bake the cookies: Bake the cookies for 13 to 15 minutes, until firm to the touch in the center. Remove them from the oven and cool completely before filling and finishing.
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To assemble the sandwiches: Place 2 teaspoons of filling on the bottom of a cooled cookie. Place another cookie, right side up, on top of the filled cookie. Repeat until all the cookies are filled.
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Storage instructions: Store cookies, well wrapped, at room temperature for up to two weeks; freeze for longer storage.