Mix all together with mixer until smooth, and pour into 3 greased 9-inch round cake pans. Bake per instructions on cake mix box.
Mix sugars and cream cheese in mixer. Add Cool Whip. Spread one inch of frosting between layers. Frost top and outside. Grate Hershey’s bar on top.
If you are not confident in dividing cake batter into pans, use an ice cream scoop to get more even layers.
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