In a separate bowl, combine cake flour, baking powder, milk powder and salt. Mix well.
Add dry ingredients into the wet ingredients bowl and mix well.
Preheat the oven 350° F
Lightly spray your silicone baking mat with cooking oil, (optional but this will help)
Place mat on baking sheet, pour batter onto the mat
Bake for 8 minutes (check at 6 minutes) toothpick should come out clean. *8 mins was perfect for oven and our mat, it does not take long to bake because of the thinness of the batter, be sure to check at 6 mins for doneness.
Cool long enough to touch the mat without burning yourself but not room temperature. The first roll should be done when cake is warm.
Carefully peel back edges of mat from the cake.
Place a piece of wax paper over cake. Flip cake over onto wax paper side.
Carefully remove mat from cake. Place cake on mat with wax paper side down. Lightly dust cake with powdered sugar.
Using the mat carefully roll cake along with wax paper still on. Secure roll with tape and cool in the fridge for 5 minutes.