Step 1: Preheat oven to 375°F (190°C). Line a 10x15 inch jelly roll pan with parchment paper and spray lightly with non-stick spray.
Step 2: In a large bowl, beat egg yolks with 1/4 cup granulated sugar and vanilla extract until pale and thick.
Step 3: In a separate bowl, whisk together flour, baking powder, and salt. Gradually fold the dry ingredients into the egg yolk mixture until just combined.
Step 4: In another clean bowl, beat egg whites until soft peaks form. Gradually add the remaining 1/4 cup granulated sugar and continue beating until stiff, glossy peaks form.
Step 5: Gently fold one-third of the egg whites into the batter to lighten it, then carefully fold in the remaining egg whites until no streaks remain. Be careful not to deflate the mixture.
Step 6: Spread the batter evenly into the prepared jelly roll pan. Bake for 12-15 minutes, or until the cake springs back when lightly touched and is golden brown.
Step 7: Immediately upon removing the cake from the oven, invert it onto a clean kitchen towel generously dusted with powdered sugar.
Step 8: Carefully peel off the parchment paper. Starting from a short end, roll the warm cake and towel together tightly. Place seam-side down on a wire rack and let cool completely, about 30-60 minutes.
Step 9: While the cake cools, prepare the strawberries. If desired, gently toss sliced strawberries with 2 tablespoons of sugar and let sit for 10 minutes to release juices.
Step 10: For the whipped cream, in a cold bowl, beat heavy cream, powdered sugar, and vanilla extract until stiff peaks form.
Step 11: Once the cake is completely cool, carefully unroll it. Spread the whipped cream evenly over the cake, leaving a 1-inch border on all sides. Arrange the sliced strawberries over the cream.
Step 12: Gently re-roll the cake, without the towel, starting from the same short end. Wrap tightly in plastic wrap and refrigerate for at least 1 hour to set.
Step 13: Before serving, dust with powdered sugar and garnish with additional fresh strawberries. Slice with a sharp knife for clean cuts.