Equipment Needed
- 10×15 inch jelly roll pan
- Parchment paper
- Electric hand mixer or stand mixer
- Large, clean kitchen towel
- Sifter or fine-mesh sieve (for powdered sugar)
- Rubber spatula
- Mixing bowls
- Wire cooling rack
Step-by-Step Instructions
First, I preheat my oven to 350°F (175°C). I then line my jelly roll pan with parchment paper, leaving a slight overhang on the short ends. I lightly grease the parchment paper and the exposed sides of the pan—this is my insurance policy. In a large bowl, I combine the cake mix, eggs, water, oil, and that crucial ¼ cup of extra flour. I beat it with my electric mixer on medium speed for exactly 2 minutes, scraping down the sides once. The batter will be thin and silky. I pour it into the prepared pan, spreading it into an even layer with my spatula, making sure it reaches all the corners. I give the pan a few gentle taps on the counter to release any air bubbles.
I bake the cake for 12-14 minutes. It’s done when the top springs back lightly when touched and the edges just begin to pull away from the sides of the pan. This timing is critical—overbaking leads to a dry cake that cracks. While the cake bakes, I lay out a clean kitchen towel and dust it generously with powdered sugar. As soon as I pull the cake from the oven, I run a knife around the edges to loosen it. Then, I immediately invert the hot cake onto the sugar-dusted towel. I carefully peel off the parchment paper—it should come off easily.
Now, here’s the key rolling step. Starting at one short end, I use the towel to gently but confidently roll the warm cake up into a log, towel and all. I roll it tightly but without squeezing. I then place the towel-wrapped cake log, seam-side down, on a wire rack to cool completely. This “pre-roll” trains the cake’s memory, so when I unroll it later to add the filling, it will want to curl back up beautifully without cracking. I let it cool for at least one hour, resisting the urge to peek.(See the next page below to continue…)