Ingredients
Equipment
Method
- Preheat the oven to 375°F and line large baking sheets with parchment paper. This preparation prevents sticking and ensures the cakes bake evenly without burning the bottoms.
- Sift the flour, cocoa powder, baking soda, and salt together into a medium bowl. Sifting removes lumps from the cocoa and ensures a smooth, uniform batter.
- Beat the butter and brown sugar on medium-high speed for 3 minutes until light and fluffy. Add the egg and vanilla, beating for another 3 minutes to fully incorporate air.
- Alternate adding the flour mixture and buttermilk to the butter mixture, starting and ending with the flour. Mix on low speed just until combined to keep the texture tender and soft.
- Scoop mounds of batter onto the prepared sheets spaced 2 inches apart using a medium spring-loaded scoop. Bake for 11 minutes until the tops spring back when gently pressed.
- Beat the marshmallow creme and butter for the filling until combined, then mix in powdered sugar, vanilla, and salt. Whip on medium-high for 3 minutes until the mixture is very smooth and fluffy.
- Pair the cooled cakes by size and spread or pipe the filling onto the flat side of one cake. Top with the second cake to form a sandwich and serve immediately.
Nutrition
Notes
Use a spring-loaded scoop to ensure all cakes are the same size for easy pairing. If the filling feels too soft, chill it for 10 minutes before assembling the sandwiches.
