1. Combine 3/4 cup butter and sugar in large bowl. Beat at medium speed, scraping bowl often, until creamy. Add egg and vanilla; continue beating until well mixed. Reduce speed to low; add flour, cocoa and salt. Beat until well mixed. 2. Divide dough in half; shape each half on lightly floured surface into 8-inch long square log with 1 1/2-inch sides. Wrap in plastic food wrap; refrigerate until firm (2 hours or overnight). 3. Heat oven to 325°F Cut logs into 1/4-inch square slices with sharp knife. Place squares 1 inch apart onto ungreased cookie sheets. Bake for 6 to 8 minutes or until set. 4. Combine powdered sugar and 1/4 cup butter in small bowl. Beat at low speed, adding enough liqueur for desired spreading consistency. Spread about 1 teaspoon filling on cookie, top with second cookie. Press together gently. Sprinkle with powdered sugar, if desired. 5. Make Ahead: Prepare cookies as directed; cool completely. Freeze in airtight container up to 1 month. When ready to use, thaw cookies completely. Prepare filling and assemble cookie sandwiches as directed. 6. Recipe Tip 7. Make sure not to slice the cookie dough too thick or the cookies will not be crisp. ---------------------------------------------------------------------------
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