Hazelnut Wafer Sandwiches Recipes

Steps:

• Cookies: In a bowl, whisk together flour, cocoa, sugar, baking powder, and salt. In a large bowl, whisk together butter and egg. Add brown sugar, and whisk to combine. Gradually add to flour mixture and stir with a spatula until liquid is absorbed. Transfer to a sheet of plastic wrap.
• Divide dough into thirds; roll out each portion 1/16-inch thick on a nonstick baking mat, topped with plastic wrap. Stack on a baking sheet, and refrigerate until firm, about 30 minutes.
• Preheat oven to 350 degrees. Using a 2-inch cookie cutter, cut dough into rounds; transfer to parchment-lined baking sheets. Reroll scraps once and cut more rounds, to make a total of 72 cookies. (If dough becomes soft, freeze until firm.) Bake cookies, rotating sheets halfway through, until firm and fragrant, 9 to 10 minutes. Transfer sheets to wire racks and let cool completely.
• Filling: In a large bowl, beat butter, confectioners' sugar, vanilla, and salt, starting on low speed, then increasing to high for 2 minutes, scraping down sides of bowl occasionally. Stir in melted chocolate to combine.
• Spread 2 tablespoons filling each on half of cookies, then sandwich with remaining cookies. Roll edges in chopped hazelnuts to adhere. Chill overnight before serving. (Assembled cookies can be refrigerated in an airtight container up to 2 days.)

Steps:

• Put oven rack in middle position and preheat oven to 350°F.
• Toast hazelnuts in a shallow baking pan until fragrant and skins begin to loosen, about 6 minutes. Rub nuts in a kitchen towel to remove any loose skins (some skins may not come off) and cool to room temperature.
• Pulse nuts and 1/4 cup sugar in a food processor until nuts are finely ground, then add flour and a pinch of salt, pulsing until combined. Add butter and pulse until dough just forms a ball. Divide dough in half, then roll dough into 2 (11-inch-long) logs (each about 1-inch wide). Chill, wrapped in plastic wrap, 1 hour.
• Cut logs crosswide into 1/2-inch slices and arrange rounds 2 inches apart on 2 baking sheets.
• Bake, 1 sheet at a time, until bottom edges just being to turn pale golden, 12 to 15 minutes. Cool cookies on a rack for about 5 minutes.
• Once cookies are cooled, add 1 teaspoon of refrigerated chocolate sauce to half of the batch of the cookies. Place the other half of the batch of cookies on top of the chocolate filled ones to form sandwiches. Place in refrigerator and take out just before serving.