To Make Whoopie Pie Filling: Beat egg white and mix with the milk, 1 teaspoon vanilla and 125g of the icing sugar. Mix well then beat in the butter and the remaining sugar. Beat until light and fluffy.. Welcome to Flonga Games! All the games on our site are FREE to play and we launch new games every day. You can play thousands of free online games including action, life, puzzle, skill and sports games.. Ever heard of a whoopie pie? They're a bit like a macaroon but with a more cake-like texture. Hugely popular Stateside, the name comes from when Amish women would put them in farmers' lunchboxes and they'd supposedly shout 'whoopie' if they found one in their box!. A whoopie pie is a sweet baked item which is a cross between a soft biscuit, a cake and a pie. It is made up of two round pieces of cake-like biscuits (cookies) which are sandwiched together with a sweet, creamy filling. Other names given to these sweet delights have included hucklebucks, gobs and BFOs (big fat Oreos).. Chocolate whoopie pies are an American favourite that you can now create at home with this easy to follow, delicious and simple recipe from Jamie Oliver.. 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..