Step 1

In a medium bowl, whisk together flour, salt, and baking powder; set aside. In a large bowl, whisk together olive oil and sugar until combined. Whisk in egg. Add dry ingredients to bowl and stir until comes together in a dough. Stir in pistachios. Divide dough in two and wrap each half in plastic wrap and chill for one hour or more.

Step 2

Adjust oven rack to middle position and preheat oven to 350°F. Line two baking sheets with parchment paper.

Step 3

Form each half of dough into an approximately 3 1/2-inch by 8-inch log and place one on each baking sheet. Bake until golden, 45 minutes. Take cookies out of oven and decrease oven temperature to 300°F.

Step 4

When cool enough to handle, use a serrated knife to cut logs on the bias to form 1-inch wide cookies. Place cookies, cut side down, on baking sheet. Place back in oven and bake until dry and toasted, about 10 minutes more.