In a mixing bowl, sift flour, salt and baking powder. Set aside.
In a stand mixer, cream together butter and sugar. Add in milk, eggs and vanilla.
Using the paddle attachment, slowly add the dry ingredients into the wet. Beat on high for 1 minutes.
Pour into batter into individual baking tins, filling only half way.
Bake at 325 for 16 minutes.
For Frosting.
Using a electric beater cream together cream cheese, butter and vanilla. Add in powdered sugar. Beat for 1 minute on high.
Allow Twinkies to cool completely prior to filling.
Using a cake decorator or piping gun, fill Twinkies from the under side, poking three holes and squirting in frosting of choice.