Maine Whoopie Pie Festival, Dover-Foxcroft, ME. 11,092 likes · 2,124 were here. June 22, 2019 downtown Dover-Foxcroft Maine.Bakers 10 am until they run. Product Features free way to bake ideal, crisp macaroons and delicious whoopie pies. Chocolate Peanut Butter Whoopie Pies are a dessert lover’s dream. Marshmallow fluff swirled with peanut butter sandwiched between two soft chocolate cookies. These are a family favorite! Marshmallow fluff swirled with peanut butter sandwiched between two soft chocolate cookies.. 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!. 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.. 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..