01 - Preheat oven to 350°F. Grease a 9x9-inch baking pan and line with parchment paper for easy removal.
02 - Whisk together flour, ground ginger, cinnamon, cloves, nutmeg, baking soda, and salt in a medium bowl.
03 - In a large bowl, cream the softened butter with brown sugar until light and fluffy.
04 - Beat in the egg, then stir in molasses until the mixture is smooth and well combined.
05 - Gradually add dry ingredients to the wet mixture, folding gently to combine.
06 - Stir in hot water until batter is smooth and uniform.
07 - Pour batter into prepared pan, smooth the top, and bake for 35 minutes or until a toothpick inserted in the center comes out clean.
08 - Allow to cool in pan for 10 minutes, then transfer to a wire rack to cool completely. Cut into 12 squares to serve.