ice cream sandwich cookie
2 2/3 cups (335 grams) all-purpose flour
2/3 cup plus 1/4 cup (75 grams) extra dark or Dutch-processed unsweetened cocoa powder
1 1/4 cups (2 1/2 sticks or 285 grams) unsalted butter, softened
1 cup (200 grams) granulated sugar
3/4 teaspoon table salt
2 large egg yolks
1 tablespoon vanilla extract
Transfer the dough to a lightly floured work surface and divide into two equal pieces. If the dough is too soft to handle, wrap and chill it until firm enough to roll out (I recommend 30 minutes only; any longer and it becomes crumbly to roll out). Roll each batch into a 1/4-inch thick rectangle, about 10 by 8 inches. Cut into a total of 24 20 2-by-4-inch rectangles. You may have enough extra to reroll the scraps and create 4 more 2-by-4-inch rectangles, in which case, you could make two additional sandwiches.
Use an offset spatula to transfer the rectangles to the prepared sheets; you’ll only need an inch space between them. Use the tip of a thermometer (totally brilliant tip from Amy, by the way; it made far better indentations than skewers that I usually use for docking) to poke the cookies with holes (Amy recommends 14 holes but I used this as my guide and made more).
Bake the cookies for 16 to 18 minutes, or until they stay firm when tapped in the center. Transfer to a wire rack to cool completely. Repeat with remaining cookie dough, rerolling scraps as needed.
Meanwhile, line the bottom of a 9-by-13-inch pan with parchment paper, allowing it to overhang on two sides (it will act as a sling for the ice cream). Spread the softened ice cream into the pan, smooth the top and freeze until firm, about one hour (or longer if your freezer is as terrible as mine).
Run a knife along the exposed sides of the pan to loosen the ice cream. Holding onto the parchment paper, lift ice cream out of the pan and onto the work surface. Using one of the cookies as a template, cut ice cream into 10 to 12 2-by-4-inch bars (cut the number of cookie pairs your batch yielded). Strangely, I found using kitchen shears to go right through the ice cream and the paper underneath the easiest. I then flipped each piece of ice cream onto a cookie, peeled off the paper, and finished sandwiching the rectangle of ice cream with a second cookie.
(Look, I’d be lying if I didn’t tell you that this whole ice cream part caused a spectacular mess in my kitchen. Huge! It was an ice cream massacre! But, I was rushing and you should not. If your ice cream begins to soften, just slide it back into the freezer for a bit and it will become easy to work with again. Promise. Do as I say, not as I did, unless you like sticky floors.)
Wrap each ice cream sandwich in plastic and please, again, listen to Amy here. I was all “Oh, let me just get them cold again and I’ll wrap them later.” Which was wrong. They continue to lose their shape for a bit, runny and melting, before they freeze up and that is why my sandwiches were kind of a mess. “Sealing” them into their shape immediately with plastic is, well, the reason that Amy is a sweets stylist and my food looks, uh, “handmade.”
Freeze until just before serving.