Preheat your oven to 350℉. Spray a 10x15 inch baking sheet with cooking spray and then line it with parchment paper. This will ensure the parchment paper will stick to the pan. Set aside.
In a medium size bowl, whisk together the flour, cocoa powder, baking powder, and salt.
In another medium size bowl whisk the eggs, sugar, butter, vanilla, and coffee until there are no lumps.
Pour the wet ingredients into the bowl with the flour mixture and stir using a spatula. If lumpy switch to a whisk and whisk until smooth.
Spread the cake batter evenly into the prepared pan using a spatula. Gently tap the pan a few times on the counter, this will remove any air bubbles.
Bake for 10 to 12 minutes or until the top of the cake springs back when touched.
While the cake is still hot, carefully lift the cake with the parchment paper out of the baking sheet and slowly roll the cake using your hands, rolling from the short end to the other short end. Let the cake cool completely.