In a saucepan over medium heat combine the cranberrys, granulated sugar and water. Cook stirring occasionally until all of the cranberrys have popped, and the mixture has thickened to a jam like consistency, about 15 minutes, set aside to cool.
Preheat oven to 350. Spray a 9 by 13 inche baking pan with non stick spray, line it with parchment paper or foil with ends of paper extending over side of pan for easy removal, spray paper lightly with non stick spray
In a large bowl, mix together the cake mix, oats, brown sugar, ginger and cinnamon, add in the eggs and melted butter and combine to moisten. Set aside about 11/2 cups of the mixture for the topping.
Spread remaining mix in baking pan evenly, I used a small off set spatula to spread but the back of a spoon also works.
Spread the cooled cranberry mixture over the crust. Add chocolate chips to reserved cake/oat mixture and mix in. Pinch off pieces of mixture and evenly drop on top of cranberry layer ( it will spread out to cover when cooking)
Bake for 35 to 40 minutes in the preheated 350 oven until top is a light golden brown. Cool in pan at least 40 minutes on a rack before removing. To remove run a knife around any places where the bar touched the pan and gently lift parchment paper. When cool cut into bars.