In a large mixing bowl, cream together the butter, brown sugar, and molasses until light and fluffy.
Add the eggs, one at a time, mixing well after each addition.
In a separate bowl, whisk together the flour, baking powder, cinnamon, ginger, cloves, nutmeg, and black pepper.
Gradually add the dry ingredients to the butter mixture, mixing until a soft dough forms.
Cover the dough and refrigerate for at least an hour to allow it to firm up.
Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
Roll the chilled dough into small balls, approximately 1 inch in diameter, and place them on the prepared baking sheet.
Bake for 12-15 minutes, or until the cookies are lightly golden brown.
Remove from the oven and let the cookies cool on a wire rack.
Once completely cooled, roll the cookies in powdered sugar, ensuring they are evenly coated.
Store the Pfeffernüsse cookies in an airtight container, where they will stay fresh for up to two weeks.