Step 1

Whisk together flour, cocoa, baking soda, and salt. In a separate bowl, whisk together oil, granulated sugar, egg, honey, and vanilla. Stir in flour mixture, then cover and refrigerate at least 30 minutes and up to 1 day.

Step 2

Preheat oven to 350°F. Roll level teaspoons of dough into balls and coat in sanding sugar. Place on baking sheets lined with parchment, spaced about 2 inches apart. Refrigerate until firm, 15 minutes.

Step 3

Bake, rotating sheets once, until cookies are flattened and set around edges, 10 to 12 minutes. Let cool completely on sheets. Store cookies in an airtight container at room temperature up to 1 week.