Coat a 8x8” baking dish with cooking spray and dust with flour to coat evenly. Set aside.
In a large bowl sift the dry ingredients together. Add the water, molasses, melted butter and egg whites. Beat with electric mixer on medium until combined then for 2 minutes on high. Fold in chopped crystallized ginger chunks (optional).
Spread into prepared baking dish. Bake for 20 minutes or until a toothpick comes out clean. Cool on a rack for 10 minutes before cutting.
Serve with whipped cream or your favorite whipped topping if desired.
The crystalized ginger may be omitted for less sugar. Nutrition information is without.