Preheat oven to 350°F and grease a 13-by-9- inch baking pan. In a large bowl, combine Bisquick, 1 1/4 cups sugar and ginger. In a separate bowl, mix milk with molasses, and then beat in butter and eggs.
Add liquid ingredients to dry ingredients and stir until blended and smooth. Pour batter into prepared pan and bake until a toothpick inserted in center comes out clean, about 25 minutes. Turn out onto a wire rack and let cool.
Beat cream with remaining 2 Tbsp. sugar until it forms stiff, fluffy peaks.
Cut cake into 8 equal pieces. Spoon a dollop of applesauce onto each of 4 dessert plates, if using. Arrange a gingerbread slice on each plate. Spread whipped cream on those 4 pieces and then top with other pieces. Dollop with more whipped cream.