Generous 1-3/4 c. flour
1 tsp baking soda
large pinch of salt
2 tsp ground cinnamon
1/2 cup butter, softened
3/4 cup plus 2 T sugar
1 large egg, beaten
1 tsp vanilla extract
2/3 c. buttermilk
Coffee filling: Beat 1/2 c. unsalted butter, softened, scant 1/2 c. cream cheese, 1 T strong cold black coffee together until well-blended. Gradually beat in 2-1/2 c. confectioner's sugar.
Sift together the flour, baking soda, salt and 1 tsp. cinnamon. Place the butter and 3/4 c. sugar in a large bowl and beat with an electric mixer until pale and fluffy. Beat in the egg and vanilla followed by half of the flour mixture and then the buttermilk. Stir in the rest of the flour mixture and mix until thoroughly incorporated.
Make 30 cakes either in a prepared whoopie pie pan, muffin tin, or mounded on prepared cookie sheets. Mix the rest of the cinnamon with 2 T sugar and sprinkle over the batter. Bake in a preheated (350 degree) oven 10-12 minutes until risen and just firm. Cool for 5 min, transfer to a cooling rack and let cool. Freeze on parchment paper on a cookie sheet in a freezer before storing in ziploc bags until ready to fill.
