In a bowl, whisk ½ cup vegetable oil and 1 cup granulated sugar until glossy.
Beat in 2 large eggs one at a time, then stir in 1 teaspoon vanilla extract.
Sift in ⅓ cup unsweetened cocoa powder, 1 teaspoon baking powder, and ¼ teaspoon salt; mix until uniform.
Fold in 1½ cups all-purpose flour until a soft dough forms.
Chilling and Baking
Cover dough and refrigerate for at least 2 hours.
Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
Scoop about 1½ tablespoons dough per cookie, roll into balls, then coat in ½ cup confectioners’ sugar.
Place cookies 2 inches apart on sheets; bake for 10 minutes.
Let rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
Notes
Chill time is crucial for creating those signature crackled tops; don’t rush it.For a deeper chocolate flavor, stir in 1 teaspoon instant espresso powder with the dry ingredients.