Start by preheating your oven to 350°F (175°C). In a bowl, combine all-purpose flour, ground ginger, cinnamon, nutmeg, baking soda, and salt. Set the mixture aside.
In another bowl, cream together the softened butter and brown sugar until light and fluffy. Beat in the egg and molasses until well blended.
Gradually add the flour mixture to the wet ingredients, stirring until combined. Chill the dough in the refrigerator for about 10 minutes to make it easier to handle.
Once chilled, scoop out tablespoon-sized portions of dough and roll them into balls. Place them on a prepared baking sheet.
Use your thumb to create an indentation in the center of each dough ball. Fill each thumbprint with a little jam or jelly.
Bake for about 10-12 minutes, or until the edges are golden. Allow the cookies to cool on the baking sheet before transferring them to a wire rack.
Notes
These cookies are best enjoyed fresh but can be stored in an airtight container for a few days. Perfect for gifting!