Cream the softened butter and packed brown sugar together in a bowl until the mixture is fully blended and smooth.
Incorporate the egg and molasses into the mixture, beating until the dough becomes light and fluffy.
Stir in the baking soda, ground ginger, nutmeg, and cinnamon, ensuring the spices are evenly distributed.
Gradually add the flour, mixing it in thirds to avoid lumps, until a consistent dough forms.
Cover and refrigerate the dough for at least 2 hours to allow it to firm up.
Preheat your oven to 375°F (190°C).
Form the dough into small balls and roll each one in powdered sugar until fully coated.
Place the cookie dough balls on a baking sheet and bake for 9-10 minutes, or until the cookies have a crinkled appearance and are set on the edges.