Prepare Duncan Hines Keto-Friendly Classic Yellow Cake Mix according to the package directions. Bake the cake and allow it to cool completely before handling.

Place a saucepan over med-high heat and add the whole cranberries, water, and sugar-free sweetener. Bring the mixture to a boil and break apart 3/4 of cranberries to release their juices; leave some of the cranberries whole for the topping. 

Boil for 5-8 minutes and remove the saucepan from heat. 

Poke holes into the cake and drizzle some of the cranberry sauce into each hole.

Crumble the cooled cake and set it aside.

Spoon 2 tbsps of the cranberry crumble mixture into the bottom of each serving glass.

Fill the bottom portion of each glass with crumbled cake and top with the Reddi-wip® Zero Sugar whipped topping, add more of the crumbled cake, and top with more Reddi-wip® Zero Sugar.

Drizzle a tablespoon of the cranberry syrup on top and add a single whole cooked cranberry on top.

Serve.