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1
Stir together flour, cinnamon, and salt in a bowl.
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2
Beat together butter, granulated sugar, and zest in a large bowl with an electric mixer at medium-high speed until pale and fluffy, about 3 minutes. Reduce speed to low and add flour mixture in 3 batches, mixing until dough just comes together in clumps, then mix in pistachios and cranberries. Gather and press dough together, then divide into 2 equal pieces. Using a sheet of plastic wrap or wax paper as an aid, form each piece of dough into a log about 1 1/2 inches in diameter. Square off long sides of each log to form a bar, then chill, wrapped in plastic wrap, until very firm, at least 2 hours.
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3
Put oven racks in upper and lower thirds of oven and preheat oven to 350u00b0F. Line 2 large baking sheets with parchment paper.
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4
Brush egg over all 4 long sides of bars (but not ends). Sprinkle decorative sugar on a separate sheet of parchment or wax paper and press bars into sugar, coating well.
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5
Cut each bar crosswise into 1/4-inch-thick slices, rotating bar after cutting each slice to help keep square shape. (If dough gets too soft to slice, freeze bars briefly until firm.) Arrange cookies about 1/2 inch apart on lined baking sheets.
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6
Bake cookies, switching position of sheets halfway through baking, until edges are pale golden, 15 to 18 minutes total. Transfer cookies from parchment to racks using a slotted spatula and cool completely.
