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1
Beat together butter and sugars in a large bowl with an electric mixer at medium-high speed until light and fluffy, then beat in baking powder and soda, spices, and salt until well combined. Add eggs and vanilla and beat well.
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2
Add flour and mix on low speed until just combined well. Stir in oats, pistachios, and cranberries.
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3
Divide dough in quarters. Shape each quarter on a large sheet of wax paper, using paper as an aid, into a 9-inch-long log, and wrap up tightly in paper first, then in plastic wrap, twisting ends (like a piece of hard candy). Chill until firm, at least 4 hours.
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4
Heat oven to 350u00b0F with racks in upper and lower thirds. Line 2 large baking sheets with parchment paper.
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5
Work with 1 log at a time, keeping remaining log chilled. If log softens as you work with it, rewrap it and chill or freeze it until firm. Using serrated knife, cut a 1/4-inch-thick slice from log with a sawing motion and place on baking sheet. Continue cutting, arranging slices as cut about 2 inches apart on sheet.
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6
Bake, switching position of sheets halfway through baking, until golden and set, 8 to 10 minutes total. Cool cookies on baking sheets 1 minute before transferring to racks to cool completely. (Parchment can be reused, but cool baking sheets between batches.)
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7
If garnishing with a drizzle of melted chocolate, finely chop the chocolate then melt it in microwave at 50 percent power for 30-second intervals, stirring, until smooth. Or, melt the chopped chocolate in a metal bowl set over a pan of barely simmering water.
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8
Cool chocolate slightly, then put in plastic bag and press out excess air. Snip a tiny opening in bottom corner of bag, then twist bag firmly just above chocolate and drizzle over cookies on racks set over wax paper or a pan. Let cookies stand at cool room temperature until chocolate is set.
