Frosted Gingerbread Brownies Ingredients Gingerbread Brownies 1 cup (2 sticks / 227 g) unsalted butter, melted 1 ½ cups (300 g) light brown sugar, packed 2 large eggs, room temperature 2 tablespoons molasses 1 teaspoon vanilla extract 2 ½ cups (312.5 g) all-purpose flour 1 tablespoon ground ginger 2 teaspoons cinnamon 1 teaspoon baking powder ½ teaspoon kosher salt Gingerbread Ermine Frosting 1 cup (245 g) whole milk 5 tablespoons all-purpose flour 1 cup (2 sticks / 227 g) unsalted butter, room