1-First Step: Prepare the Mise en Place Gather all ingredients. Whisk dry items: 2 cups all-purpose flour, 1 cup granulated sugar, 1/2 cup cocoa powder, 1 tsp baking soda, 1/2 tsp salt in a bowl. In another, mix wet: 1 egg, 1 cup buttermilk, 1/2 cup oil or butter, 2 tsp vanilla. Combine gently until smooth. Chill batter 30 minutes for even shapes. This step sets up success for uniform Halloween themed whoopie pies.

2-Second Step: Scoop and Bake the Cakes Scoop 1.5 tbsp batter per cookie, spacing 2 inches apart on sheets. Bake 10-12 minutes until springy. Cool on racks fully, about 30 minutes. Yields 24-36 cakes for 12-18 pies. For dietary tweaks, use vegan subs here without changing bake time.

3-Third Step: Make the Filling Beat 1/2 cup softened butter, 1 cup powdered sugar, 1 tsp vanilla until fluffy. Fold in 1 cup marshmallow creme and orange gel coloring. For low-cal, swap half butter for yogurt. Pipe or spread generously on flat cookie sides.

4-Fourth Step: Assemble the Pies Pair similar-sized cakes. Pipe filling on one, top with another. Press gently. For vegan or gluten-free, ensure all subs match.

5-Fifth Step: Add Festive Decorations Pipe black icing for webs or ghosts. Attach candy eyes, sprinkles, or candy corn. Let set 15 minutes. These touches make ghost whoopie pies pop for parties.

6-Final Step: Serving Suggestions Serve at room temp for best texture. Pair with milk or hot cocoa. Store as noted below. Adapt shapes with cutters for pumpkin or bat designs. Troubleshooting: If cakes spread, chill longer; dry filling means more creme.