
Ingredients
2/3C Blanched hazelnuts
3ea Large eggs
2T Instant espresso powder, or
instant coffee powder
2C AP flour
2t Baking powder
1t Kosher salt
1/4lb Unsalted butter at room temperature
1C Sugar
+more Sugar for sprinkling
2t Vanilla extract (alternate coffee extract)
3oz Semi sweet chocolate coarsely chopped
Process
Preheat the oven to 350F
Place racks in upper and lower 1/3 of the oven
Toast the hazelnuts on a rimmed cookie sheet tossing once until golden brown (8-10minutes)
Cool
Chop very coarsely
Reduce oven heat to 325F
Separate yolk from 1 egg in a bowl, and set aside the white for basting later
Crack the remaining 2 eggs into the bowl with the yolk
Add espresso powder and beat with a fork to combine and dissolve
Whisk flour, baking powder, and salt in a medium bowl
Using an electric mixer on medium speed, beat butter and 1C sugar until light and creamy (about 2 minutes)
Scrape down the sides of the bowl, and add the egg yolk mixture and vanilla extract
Beat to just combine
Scrape down the sides of the bowl again and beat until smooth
Add dry ingredients, and mix on low speed to combine
Add hazelnuts and chocolate and mix to evenly distribute
Divide dough evenly between two parchment lined baking sheets
Run your hands under cold water and shape the dough into 5 inch squares 1 inch thick
Beat the reserved egg white with a fork until foamy and brush over the loaves(you won’t need all of it)
Sprinkle very generously with sugar
Bake the loaves, rotating front to back and top to bottom halfway through (30-35minutes)
Bake until firm in the center and starting to crisp on the edges
Transfer the sheets to wire racks and cool for 15 minutes
Transfer the loaves to a cutting board
Using a serrated knife cut the loaves into 1/2in thick slices
Arrange on a baking sheet cut side down and bake 30-35minutes, rotating top to bottom and front to back at half time until dry and crisp
Transfer back to wire racks and let cool
Can be baked 1 week ahead. Store at room temperature in airtight container