Bake 12–14 minutes until set and springy. Cool on sheets 5 minutes, then on racks.
Beat cream cheese and 1/4 cup butter until silky. Add powdered sugar, 1 1/4 teaspoons vanilla, salt, and cinnamon; beat until thick and spreadable.
Pair similar-sized cakes. Spread or pipe filling on one half and cap with its mate.
Chill assembled whoopie pies 15 minutes to help the filling set before serving.
Notes
Variation: Add 1–2 tbsp maple syrup to the filling for a maple-cream twist, or roll the edges in finely chopped pecans. Storage: Keep covered in the refrigerator up to 4 days; bring to room temp before serving. Freeze individually wrapped pies up to 2 months.This recipe is an original creation inspired by classic Pumpkin Whoopie Pies for Fall flavors. All ingredient ratios and instructions are independently developed.