Combine the flour, sugar, cinnamon and baking powder in a bowl.
Add the espresso powder to the milk. Stir to dissolve.
Add the cooled butter to the milk mixture.
Lightly beat the eggs, then add to the milk mixture, mixing well.
Add the dry ingredients to the wet ingredients, a little at a time. Stirring as you go, until all ingredients are thoroughly combined.
Fill the cupcake liners to about 1/4 inch from the tops.
Bake on the centre rack for about 15 minutes. To test, insert a toothpick into the centre of a cupcake. It should come out clean.
Remove cupcakes from the oven to a wire rack to cool.
Icing
Beat the cream cheese with an electric mixer until fluffy.
Add butter and beat to combine.
Beat in vanilla and espresso powder.
Add the icing mixture a little at a time and mix until combined well. Scrape down the sides of the bowl as necessary.
Using an apple corer, insert it into the middle of the cupcake, going down about 2/3 and then pull it out. You could also carefully scoop out the centre with a spoon if you don't have an apple corer.
Fill the hole with icing, using a piping tip or scoop it in with a spoon.
Decorate the tops of the cupcakes with icing. (These ones were done with a #1A tip).
Nutritional information is an estimate and provided as a courtesy. The values may vary according to the ingredients and tools that are used. Please use your preferred nutritional calculator for more detailed information.