Preheat your oven to 350°F (175°C) and line a 9×9-inch baking dish with parchment paper.

In a large mixing bowl, combine melted unsalted butter and packed light brown sugar until smooth and creamy, about 2-3 minutes.

Add eggs, light molasses, and vanilla extract. Mix until fully incorporated, about 1-2 minutes.

In a separate bowl, whisk together all-purpose flour, ground ginger, ground cinnamon, baking powder, and kosher salt.

Gradually add the dry mixture into the wet ingredients, stirring gently until just combined. Be careful not to over-mix.

Pour the batter into the prepared baking dish and spread it evenly.

Bake for 30-35 minutes until the edges are set and the center slightly jiggles. A toothpick should come out with a few moist crumbs.

After baking, cool completely in the pan on a wire rack. Dust with confectioners' sugar before slicing.