
To make the cake, preheat the oven to 350°F (177°C). Line bottom of 1 9-inch springform pan (at least 3 inches tall) with parchment paper.
Separate the egg whites and yolks
In a mixing bowl with whisk attachment, whisk together egg yolks and ½ cup of sugar until pale and tripled in volume, about 5 minutes.
Sift flour and salt in a separate bowl.
In another mixing bowl, beat egg whites until foamy and add cream of tartar, then sugar gradually until stiff peaks form.
Fold whipped egg whites into egg yolk mixture, add sifted flour, and whisk well.
Pour the batter into prepared pan and bake for about 40 minutes.
Let the cake cool for 5 minutes in the pan, then refrigerate overnight.
Prepare raspberry jello layer and refrigerate until set.
Make simple syrup and cool completely.
Beat cream cheese and butter and add powdered sugar and vanilla to make frosting.
Assemble the cake by slicing the cake into layers and adding frosting and jello layers.
Finish by decorating the top with reserved frosting.