Step 1: Preheat your oven to 350°F (175°C) to ensure even baking.
Step 2: Melt the chocolate in a microwave-safe bowl, heating in 20-second intervals until smooth. Allow to cool slightly.
Step 3: In a large bowl, whisk together sugar, oil, and vanilla. Add melted chocolate and mix until smooth.
Step 4: Add eggs one at a time, mixing well after each. If using, add espresso granules now.
Step 5: In another bowl, whisk flour, baking powder, and salt. Gradually mix into wet ingredients until just combined.
Step 6: Cover dough with plastic wrap and refrigerate for about 30 minutes.
Step 7: Line cookie sheet with parchment and place confectioners' sugar in a shallow dish.
Step 8: Scoop tablespoon-sized portions, roll into balls, and coat in confectioners' sugar.
Step 9: Place dough balls on the sheet, spaced 2 inches apart. Bake for 10-12 minutes until crinkled.
Step 10: Cool on the sheet for 5 minutes, then transfer to a cooling rack. Enjoy warm or at room temperature!
