Preheat the oven to 375°F. Line the bottom of a 10x15x1 baking sheet with parchment paper. Lightly spray the baking sheet with nonstick cooking spray. Set it aside.
In a small mixing bowl, whisk together the flour, baking powder, and salt. Set it aside.
Using a stand mixer or a medium-sized mixing bowl and a handheld mixer on high speed, beat the egg whites and white vinegar to medium peaks.
Continue mixing on high and slowly add the ¼ cup of granulated sugar. Continue beating the egg white mixture to the stiff peak stage. This could take between 5 to 7 minutes. Set egg yolk mixture aside.
Using a stand mixer or a large mixing bowl and a handheld mixer on medium-high speed, beat the egg yolks until they reach a slightly pale yellow color, about 2 minutes.
Add the ½ cup granulated sugar, milk, vanilla, and almond extract. Continue mixing for another 1½ to 2 minutes until well incorporated.
Add half of the flour mixture, and mix just until combined. Add the remaining flour, and mix until completely incorporated.
Fold in the egg white mixture a quarter at a time.
Evenly sprinkle the red and green sprinkles onto the prepared baking sheet.
Pour the cake batter on top of the sprinkles. Gently tap the baking sheet to release any bubbles.
Bake for 10 to 12 minutes, until just golden.
While the cake is baking, lay out a thin tea towel and dust it with ¼ cup of powdered sugar. You will also need a large cutting board for the dusted cake transfer.
When the cake has finished baking, run the tip of a sharp knife along the edge of the baking sheet.
Carefully flip the dusted tea towel on top of the baked cake, dusted side against the cake. You will need to leave a small “tail” of the tea towel on the short edge of the cake for rolling the cake up.
Place a large cutting board on top of the tea towel. Remember, the baking sheet will still be very hot, so be sure to protect your hands.
Quickly flip the baking sheet over, so it is now lying on top of the tea towel and cutting board.
Carefully peel off the parchment paper.
Lightly dust the top of the cake with powdered sugar.
Flip the small tail of the tea towel over the short edge of the cake. Carefully begin rolling one end toward the other. Once rolled, transfer to a cooling rack to finish cooling completely.