- Preheat the oven to 350°F. 
- Line a 15x10-inch jelly roll pan with parchment paper. Leave extra parchment paper hanging over the 15-inch sides for easy removal of the cake. You can also spray the parchment paper with a non-stick spray, but it is not necessary. 
- In a medium bowl, whisk together flour, cocoa powder, baking powder, and salt until combined. Set aside. 
- In a separate bowl, whisk together eggs and granulated sugar for about 1 minute, or until thick. Add in the oil, vanilla extract, and coffee (use hot water if you don't have coffee) until combined. 
- Fold in the flour mixture and stir until combined. 
- Pour the batter into your prepared jelly roll pan. Smooth out the batter and gently tap on the counter.  
- Bake in a 350°F oven for 10-12 minutes, or until the center no longer appears wet and an inserted toothpick is removed with a few crumbs. 
- One a clean hard surface such as a countertop, lay out a clean dish towel and generously sprinkle with confectioners sugar or cocoa powder.  
- Once the cake is done baking, carefully (using oven mitts) flip it over onto the clean dish towel in one quick motion. Fold about 2 inches of the towel over the edge and start rolling the cake up from the short end into a tight roll. Allow to cool for 2-3 hours, or until completely room temperature.