homemade Whoopie Pies with this easy and delicious recipe. These soft, chocolatey pillows filled with fluffy marshmallow buttercream will have you hooked from the first bite!
Preheat oven to 375°F (190°C). Line baking sheets with parchment paper. Whisk together dry ingredients (flour, cocoa, baking powder, baking soda, salt). Cream butter and sugar until light and fluffy. Beat in egg and vanilla, then milk. Gently fold in dry ingredients until just combined. Scoop batter onto baking sheets, spacing them apart. Bake for 8-10 minutes, until set. Cool completely on wire racks. Beat buttercream ingredients until smooth and fluffy. Spread or pipe buttercream onto half the cooled cakes. Top with remaining cakes to create sandwiches.
Notes
Don't Overmix: Mix batter until just combined to avoid dense cakes.
Cool Completely: Ensure cakes are fully cooled before filling to prevent a messy situation.
Piping Bag Perfection: Use a piping bag for neat and even buttercream filling.