1 3/4 cups all-purpose flour
2/3 cup plus 4 teaspoons sugar
2 tablespoons plus 1 teaspoon instant espresso powder
1/2 teaspoon baking powder
1/2 teaspoon kosher salt
4 tablespoons unsalted butter, softened
2 large eggs
1 tablespoon water
1 teaspoon pure vanilla extract
1 1/2 cups toasted cashews
1 large egg white, lightly beaten