Preheat oven to 350*
Mix all cake ingredients together and pour into a parchment paper lined jelly roll pan (cookie sheet) and smooth into a rectangle 1/4 inch thick. The mix will NOT fill the entire pan.
Bake for 15-20 minutes, then let cool on a cooling rack for 5 to 10 minutes. Turn out onto a dish towel dusted with powdered sugar. Carefully remove parchment paper and dust the cake with more powdered sugar to help keep it from sticking to the towel. Roll up in the dish towel. Let cool. While it’s cooling, make the filling.
Using a hand mixer cream together the butter, cream cheese, powdered sugar and vanilla together until smooth.
When cake is cooled, carefully unroll and smear with filling. Roll back up and chill until ready to serve.