01 - Preheat oven to 350°F. Grease and line an 8-inch round cake pan with parchment paper.
02 - Whisk gluten-free flour, baking powder, baking soda, salt, ginger, cinnamon, nutmeg, and cloves in a medium bowl.
03 - Beat eggs and brown sugar in a large bowl until smooth and slightly thickened. Incorporate oil, molasses, applesauce, and vanilla until evenly combined.
04 - Gradually fold dry ingredients into wet mixture, stirring gently until just combined.
05 - Pour in hot water and stir to create a smooth, uniform batter.
06 - Transfer batter to prepared pan and smooth the surface with a spatula.
07 - Bake for 32 to 35 minutes or until a toothpick inserted in the center emerges clean.
08 - Allow cake to cool in pan for 10 minutes before removing to a wire rack to cool completely.
09 - Once cooled, sprinkle with chopped crystallized ginger and lightly dust with powdered sugar if desired.