These festive cookies are perfect for the holidays, thanks to the generous addition of crushed chocolate sandwich cookies and refreshing peppermint candies. Make sure to chill the dough before baking to ensure a thick and fluffy cookie that your friends and family will enjoy in their holiday tins.
Beat the butter, brown sugar and granulated sugar in a large bowl with an electric mixer on medium-high speed until light and fluffy, about 4 minutes. Add the vanilla, peppermint extract and eggs, then continue to beat until smooth, scraping down the sides of the bowl with a rubber spatula as needed.
Whisk together the flour, cornstarch, baking powder, salt and baking soda in a medium bowl. Gradually add the flour mixture to the butter-sugar mixture and beat on low speed until just combined. Fold in the peppermint puffs, cookie crumbs and candy-coated chocolates until evenly dispersed throughout the dough.
Divide the dough into 3-tablespoon portions and roll into uniform balls (there should be about 25 dough balls). Transfer to a large plate or baking sheet and refrigerate until chilled through, at least 1 hour and up to overnight.
Meanwhile, position an oven rack in the center of the oven and preheat to 375 degrees F. Line 2 rimmed baking sheets with parchment.
Arrange the chilled cookie dough balls on the prepared baking sheets, leaving about 2 inches between each ball. Bake one sheet at a time on the center rack until the cookies have puffed, the centers are just set and the edges have just turned golden brown, 15 to 18 minutes. Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely. Store in an airtight container at room temperature for up to 5 days.
When measuring flour, we spoon it into a dry measuring cup and level off excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.)
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