01 - Preheat oven to 375°F. Lightly grease a 15x10 inch jelly roll pan, line with parchment paper, and grease the parchment for easy release.
02 - In a large bowl, beat eggs and granulated sugar together with an electric mixer until mixture is thick and pale, about 5 minutes. Blend in vanilla extract. In a separate bowl, whisk flour, baking powder, and salt; alternately add dry mixture and milk to the egg mixture, mixing just until combined. Fold in mashed banana until incorporated.
03 - Pour batter into the prepared pan and spread evenly. Bake for 12–15 minutes, or until the center springs back lightly when touched. Remove from oven and cool for a few minutes to set.
04 - Invert the cake onto a clean kitchen towel generously dusted with powdered sugar. Peel off parchment. Begin rolling the cake from the short end, using the towel to help. Let cool completely in the rolled shape for best texture.
05 - In a bowl, beat softened cream cheese, powdered sugar, and vanilla extract until smooth. Whip heavy whipping cream in a separate bowl to stiff peaks, then gently fold the whipped cream into the cream cheese mixture to lighten.
06 - Unroll the cooled cake and spread cream cheese filling evenly over the surface. Layer sliced bananas on top of the filling. Carefully reroll the cake with the towel's guidance for an even spiral.
07 - Wrap the completed roll snugly in plastic wrap and refrigerate for minimum 2 hours until chilled. Slice and present cold for optimal flavor and texture.