Preheat the oven to 350°F (175°C). Grease and line a 9x9 inch baking pan with parchment paper.

In a mixing bowl, whisk together melted butter, granulated sugar, and brown sugar until smooth.

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

Stir in molasses until fully incorporated.

In another bowl, combine flour, cocoa powder, baking powder, ginger, cinnamon, cloves, and salt.

Gradually add the dry ingredients to the wet mixture, stirring until just combined.

Pour the brownie batter into the prepared baking pan and spread evenly.

Bake in the preheated oven for 25 minutes or until a toothpick inserted in the center comes out with a few moist crumbs.

Remove from the oven and let cool in the pan for 10 minutes before transferring to a wire rack.

Once cooled, dust the brownies with powdered sugar or drizzle with a milk glaze if desired.

Cut into squares and serve.