Preheat the oven to 375°F.
In a medium bowl, whisk together the flour, milk powder, salt, baking powder, baking soda, cinnamon, ginger, cardamom, nutmeg, cloves and black pepper.
Combine the sugar, brown sugar and brown butter. Beat with an electric mixer until very light and fluffy.
Add the egg and vanilla and mix very well again.
Add the dry ingredients and mix just until combined.
Scoop the dough onto the baking sheets (I use a 2 Tbsp scoop)
Bake for 9–11 minutes.
Let the cookies cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.
make the espresso glaze
Whisk the icing sugar, espresso powder, vanilla and salt together. Add the milk or cream a little at a time, whisking until you have a smooth, drizzleable glaze.
Drizzle the glaze over the completely cooled cookies and let it set for a few minutes before serving.