Prepare all the ingredients and the baking sheet. Grease the pan and line with parchment paper.
Preheat the oven to 335°F.
Make the egg yolk batter. In a medium-sized bowl whisk the egg yolk mixture until pale in colour. Add the dry ingredients and sift it over the egg mixture, alternating with the milk mixture in 3 to 4 additions. Mix until smooth and with no lumps.
Make the meringue. In another medium-sized bowl, whisk the egg whites and lemon juice until frothy. Then starts adding the sugar gradually until medium-stiff peaks.
Folding the meringue. Add and fold the meringue into the egg yolk batter, about a quarter cup at a time. Until no more streaks of egg yolk batter are visible. Make sure not to overmix that may result in the cake batter deflating and a cake denser.
Pour the cake batter on the prepared baking sheet with parchment paper. Tilt the pan to level or use cake scraper to even out the cake batter. Drop or tap a few times on the table to remove air pockets.
Bake the cake. Place the cake in the middle rack of the oven. Bake for 18 to 20 minutes in a preheated oven at 335°F. Depending on your oven, when the cake is no longer wet, springy and golden then it's done baking.
Cooling the cake. Remove from the oven and the baking sheet. Hold the parchment paper from the side to lift the cake and place it on the cooling rack. Cool for about 15 minutes or until room temperature. Cover with parchment paper to avoid drying out. While the cake is cooling, make the buttercream-cream cheese frosting.
Make the filling. Cream the room temperature butter and cream cheese in a medium-sized bowl using an electric mixer. Add the powdered sugar a quarter cup at a time to avoid flying all over the place. Add the Vanilla extract and whisk until smooth and fluffy. If the consistency is too thick, add a tablespoon of heavy cream if desired or adjust the amount of sugar to your desired sweetness and consistency.
With the parchment paper on top of the cake, carefully invert the cake by holding onto the side of the parchment paper. Remove the parchment paper from the cake and keep the one now at the bottom of the cake. Trim the 9" ends or trim all ends if desired. Cut one end diagonally.
Filling and rolling the cake. Place a dollop of the frosting and spread it evenly on the cake. Place the rolling pin on the back end of the parchment paper with the straight-cut end of the cake. Lift and push towards the diagonally trim end of the cake. Use adhesive tape to keep the cake wrapped in parchment paper.
Chill the cake for at least an hour before slicing.
Slice the cake. Trim the ends and clean the knife with warm water or a paper towel in between cuts.
Storing the cake. Keep in the refrigerator for up to 5 days in a sealed container. Freeze for up to 3 months.