Muffins:
Preheat the oven to 375°F (190°C).
Prepare a 12-cup muffin tin, lining it with paper cups.
In a bowl, mix together the flour, sugar, baking powder, cinnamon, and salt.
In another bowl, mix together the warm milk and instant coffee.
Add the butter, egg, and vanilla bean and mix well.
Combine the wet and dry ingredients and mix until just combined.
Fold in the chocolate chips.
Fill the prepared cups 3/4 of the way full.

Bake for 15 to 20 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Let cool for 5 minutes in the pan before transferring to a wire rack.
Once completely cooled, top with cappuccino glaze.

Cappuccino glaze:
In a mixer, combine the glaze ingredients and mix until smooth.
Cover and refrigerate until ready to use.