Instructions
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Step1Heat oven to 350° F. Line 2 cookie sheets with cooking parchment paper; set aside.
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Step2In medium bowl, beat cookie mix and cocoa. Add melted butter and egg; mix until soft pale brown dough forms.
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Step3On lightly floured surface, roll dough 1/4 inch thick. Use 1 1/2-inch round cutter to cut out circles for cookie sandwiches. Place 1 inch apart on cookie sheets.
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Step4Bake 8 minutes; transfer to cooling rack to cool completely.
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Step5Use offset spatula or butter knife to spread a dollop of frosting on flat side of one cookie. Press another cookie on frosting, flat sides together, to make a sandwich. Repeat to use remaining cookies.