Preheat oven to 350° and grease (2) 9 inch round cake pans. Set aside.
In a medium mixing bowl, whisk flour, cinnamon, ginger, baking powder, baking soda together. Set aside.
In a large mixing bowl, beat butter and brown sugar together until creamy.
Add molasses and eggs. Beat until well combined.
Alternate flour and water into the wet ingredients making sure to mix well, on low, between each addition.
Pour into prepared cake pans.
Bake for 35 minutes or until a toothpick inserted comes out clean.
Cool on a wire rack.