Fall in love with this easy recipe for whoopie pies. Two light discs of chocolate sponge sandwich a fluffy vanilla buttercream filling. Perfect for cake sales, packed lunch treats or making friends at the office!. For the batter and a 24 cm in diameter springfrom pan: 200 g of all-purpose flour (you can use 1 tbsp of starch instead of the flour) 100-150 g of spinach. For a sponge cake and a 30*40 cm baking tray: 180 g of cake flour or 160 g of all-purpose flour and 20 g of any starch 180 g of sugar 9 eggs (162 g egg yolk and 270 g of egg white). Heat oven to 180C/160C fan/gas 4 and line baking trays with parchment. Mix flour, cocoa, bicarb, sugar and a pinch of salt. Whisk the egg, oil and buttermilk together, then mix into dry ingredients with 75ml boiling water.. Beat the butter and sugar in an electric mixer on high speed until light and fluffy. Beat in the egg, followed by the vanilla and buttermilk. Reduce speed to low, add dry ingredients and beat until combined.. Whoopie Pie (20) 32 minutes. 19 reviews See all 12 recipes Recently Viewed. Whoopie Pie. Reviews and Ratings Global Ratings: (20) and I couldn't get them to turn out right -- I really thought she had left things out! She was famous for her whoopie pies. If you are having trouble with it, here is how I do it, and mine come out great. Use a good hand mixer to beat everything. Sift your .