Bored of the same old process when it comes to making a boxed cake mix? Skip the eggs and oil, and add a can of Diet Coke instead.

My grandmother, Sharon, would always make this cake for the holidays or family gatherings. The combination of the chocolate pudding and heath toffee pieces pulls at the heartstrings of every adult child. I cannot thank her enough for passing down such a simple, yet delectable recipe.

All you really need is a Betty Crocker Triple Chocolate Fudge boxed cake mix and a 12 oz. can of Diet Coke to execute Grandma's Diet Coke Delight. To make this cake even 10 times better, make it in a throwaway cake pan so you do not have to worry about the dishes or trying to get your cake pan back after the party.

Grandma's Diet Coke Delight

  • Prep Time:10 mins
  • Cook Time:35 mins
  • Total Time:45 mins
  • Servings:16
  • Easy


  • Betty Crocker Triple Chocolate Fudge Cake Boxed Cake Mix
  • 12 oz. Can Diet Coke
  • Sugar-Free Fat-Free Chocolate Fudge Pudding Mix
  • 2 cups 2% milk
  • 8 oz. bag Heath Milk Chocolate Toffee Bits
  • 12 oz. Kraft Cool Whip Lite Whipped Topping Thawed
sweet, milk, cereal, coffee, cream, chocolate
Molly McGeeney
  • Step 1

    In a medium-sized bowl, add 2 cups of cold 2% milk to the sugar-free fat-free pudding mix. Stir until combined, cover and chill.

  • Step 2

    Preheat the oven to 350°F. In a large bowl, combine the dry boxed cake mix and a 12 oz. can of Diet Coke. Mix thoroughly.

    #SpoonTip: If a hand mixer is used during this process, the cake will turn out fluffy and decadent.

    beer, coffee
    Molly McGeeny
  • Step 3

    Pour the boxed cake mix and Diet Coke mixture into the greased 9x13" cake pan. Bake for 35 minutes.

    chocolate, coffee, cream, milk, sweet, espresso, pudding, tea, caramel
    Molly McGeeney
  • Step 4

    Once the cake is completely cooled, add the pudding mixture you prepared from step 1 on top of the cake in an even layer. Then sprinkle the Heath pieces over the pudding. Then carefully spread the Cool Whip on top of the cake, creating the final layer.

    chocolate, cream
    Molly McGeeney

You can serve this in a small glass, or slice it up like a normal cake, it is delectable either way.

#SpoonTip: Top it off with a drizzle of Hershey's chocolate syrup or a few mini chocolate chips. That is what my Grandma loves to do.