Preheat the oven to 350°F (175°C) and grease a 9x13-inch baking dish.

In a large mixing bowl, combine the melted butter, granulated sugar, and brown sugar, mixing until well combined.

Add the eggs one at a time, mixing well after each addition until fully incorporated.

In a separate bowl, whisk together the flour, cocoa powder, ginger, cinnamon, nutmeg, baking powder, and salt.

Gradually add the dry mixture to the wet mixture, stirring until just combined. Do not overmix.

Fold in the chocolate chips gently, ensuring an even distribution throughout the batter.

Pour the batter into the prepared baking dish, spreading it evenly with a spatula.

Bake for 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.

Allow the brownies to cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely.

Cut into squares and serve alone or topped with whipped cream or a scoop of ice cream.