Tasty Whoopie Pies

Preheat oven to 350°F (175°C). Sift flour, cocoa, baking soda, and salt together.

Cream butter and brown sugar until pale and fluffy.

Add egg and vanilla; beat until smooth.

Alternate adding buttermilk and dry mix, beginning and ending with dry.

Scoop batter onto parchment; bake 10‑12 minutes until tops are golden.

Cool cakes on a wire rack.

Beat butter for filling, add marshmallow creme, then powdered sugar, vanilla, and salt.

Assemble pies by spreading filling between two cakes.