Giant Whoopie Pie Recipe By Tasty

Steps:

• Preheat the oven to 350˚F (180˚C). Grease and line 2 10-inch (25 cm) round cake pans with parchment paper.
• Make the whoopie pie: In a large bowl, whisk together the flour, cocoa powder, espresso powder, salt, baking soda, and brown sugar, making sure there are no lumps.
• Make a well in the center of the dry ingredients, then pour in the water, vinegar, vanilla and oil to the well. Whisk to combine, working slowly to avoid clumps.
• Scoop 2½ cups (600 g) of batter into the center of each cake pan. Use an offset spatula or a knife to spread the edges of the batter just to the edges of the pans. Do not level the top of the cake, to help create a domed shape.
• Bake for 30 minutes, or until a toothpick inserted in the center of the cakes comes out clean. Let cool in the pans for 10 minutes, then carefully transfer to a wire rack to cool completely.
• Make the filling: In a large bowl, combine the butter and marshmallow fluff and cream with an electric hand mixer for 2-3 minutes, until fully combined. Sift in the powdered sugar, then beat for another 2-3 minutes, until light and fluffy. Transfer the filling to a piping bag or zip-top bag. Cut a 2-inch (5 cm) wide opening on a corner.
• Invert a cake onto a serving platter so the domed side is facing down. Pipe a thick spiral of filling onto the cake, leaving a ¼-inch (½ cm) border around the edge, and smooth with an offset spatula. Place the remaining cake on top of the filling, domed side up, and push down slightly to attach.
• Slice and serve.
• Enjoy!