Decadent Pudding Cake Recipe (Even Better Than Sex Cake)

This Better than Sex Cake is an easy chocolate cake made from a box of cake mix and a can of diet soda. It’s finished with a simple three-ingredient frosting — instant vanilla pudding, milk, and thawed Cool Whip — then topped with chopped candy for a crunchy, indulgent finish.

Yes, the name raises eyebrows, but the concept is classic and crowd-pleasing. One of the reasons I like Weight Watchers is that no food is off limits — you can enjoy treats while watching portions and ingredients. This version uses a few swaps to keep calories lower while still delivering flavor and texture.

If chocolate isn’t your thing, try other simple cake-mix recipes such as Tomato Soup Cake, Sunshine Cake, or a Strawberry Poke Cake. There are lots of variations you can make with a boxed cake mix and a few pantry items.

Why You Will Love This Recipe

This cake is quick, budget-friendly, and lightened with simple substitutions so it fits a lower-calorie or Weight Watchers plan. Using diet soda in place of oil and eggs is an old semi-homemade hack that produces a moist cake with fewer calories.

Dairy-Free Option: I’ve replaced regular milk with a high-protein, lactose-free alternative such as Fairlife and achieved a thick, creamy pudding for the frosting. It worked beautifully and boosted protein slightly. If you prefer, regular skim milk or 1% milk works well too.

The ingredients are straightforward and easy to source — many of them are available at Aldi if you prefer to shop there. For crunch, I used crushed wafer-style candy bars, but you can substitute Kit Kats, crushed Oreos, or chopped toffee bars.

Ingredients Needed

• Cake mix – 1 (15.25 oz) box of chocolate cake mix
• Diet soda – 1 (12 oz) can of diet soda (any flavor)
• Instant vanilla pudding – 1 (1 oz) box sugar-free instant vanilla pudding
• Cool Whip – 1 (8 oz) container, thawed (fat free or regular as preferred)
• Milk – 2 cups of 1% or skim milk (or a lactose-free/high-protein milk alternative)
• Candy – about 5 mini Kit Kat bars or 3–4 regular candy bars, chopped (or substitute Heath bars, crushed Oreos, etc.)
• See the recipe card below for full measurements and yield.

How to Make Better than Sex Cake

Step 1: Preheat the oven to 350°F (175°C).

Step 2: In a mixing bowl, combine the chocolate cake mix and the can of diet soda. Stir until the batter is smooth and well combined. Pour the batter into a greased 9×13-inch baking dish and bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean.

Step 3: While the cake bakes, prepare the frosting. In a bowl, whisk the instant vanilla pudding mix with the milk until thickened. Gently fold in the thawed Cool Whip until the frosting is light and evenly combined.

Step 4: Chop the chocolate candy bars into small pieces. You want bite-sized bits that add texture to each slice.

Step 5: Allow the cake to cool completely. Spread the pudding–Cool Whip frosting evenly over the cooled cake, then sprinkle the chopped candy bars on top to finish.

Recipe FAQs

More Cake Great Recipes To Try

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Weight Watchers – Better than Sex Cake

4.5 from 6 reviews

Disclaimer: I am not affiliated with WW. I create recipes using the WW points system for personal tracking. Some recipes may reference older points systems.