Watergate Cake

There is no cake quite like Watergate Cake. This vintage beauty is tinted a gorgeous shade of pale green thanks to pistachio pudding mix, and it is topped with the most heavenly pistachio whipped cream frosting imaginable.

If you have ever seen this cake at a church potluck or holiday table, you know exactly how fast it disappears. The flavor is subtle, nutty, and not too sweet — which is exactly why people keep coming back for seconds.

With just 15 minutes of prep and a handful of simple ingredients, this is one of those retro recipes that absolutely deserves a permanent spot in your rotation.

Why You’ll Love Watergate Cake

• Stunning retro charm — that pale green color is absolutely gorgeous and always gets people talking.
• Light pistachio flavor — subtle, nutty sweetness that is refreshing rather than heavy.
• Incredibly moist — the pudding mix and oil keep this cake soft and tender for days.
• Dreamy whipped frosting — pistachio pudding folded into Cool Whip creates the lightest, creamiest topping.
• Crunchy pecan topping — chopped pecans add the perfect textural contrast.
• Foolproof recipe — starts with a cake mix, so it is nearly impossible to mess up.

Ingredients You’ll Need

• 1 box white cake mix (15.25 ounces) — white cake lets the green pistachio color shine through.
• 2 packages (3.4 ounces each) pistachio instant pudding mix — one for the cake, one for the frosting.
• 3 large eggs — for structure and richness.
• 1 cup vegetable oil — makes the cake incredibly moist.
• 1 cup lemon-lime soda (like 7-Up) — adds moisture and a subtle fizzy lift.
• 1 cup chopped pecans, divided — half goes in the batter, half on top.
• 1 container (8 ounces) Cool Whip, thawed — the base of the frosting.
• 1 cup whole milk — for the frosting pudding mixture.

How to Make Watergate Cake

Step 1: Mix the Batter

Preheat your oven to 350 degrees F and grease and flour a 9×13-inch baking pan. In a large bowl, combine the cake mix, one package of pistachio pudding mix, eggs, oil, and lemon-lime soda. Beat until smooth, about 2 minutes. Fold in 1/2 cup of chopped pecans.

Step 2: Bake

Pour the batter into the prepared pan and bake for 35 minutes, or until a toothpick comes out clean. Let the cake cool completely in the pan on a wire rack.

Step 3: Make the Frosting

Whisk together the remaining package of pistachio pudding mix and the milk until thickened, about 2 minutes. Gently fold in the Cool Whip until smooth and evenly combined. The frosting will be a beautiful light green.

Step 4: Frost and Garnish

Spread the frosting over the cooled cake and sprinkle the remaining 1/2 cup of chopped pecans on top. Refrigerate for at least 2 hours before serving to let everything set.

Tips for the Best Watergate Cake

• Use white cake mix, not yellow. Yellow cake mix mutes the green color. White lets that beautiful pistachio tint come through.
• Toast the pecans for deeper flavor. A few minutes in a dry skillet brings out their natural oils and adds a richer, nuttier taste.
• Cool the cake completely. The Cool Whip frosting will melt on a warm cake. Patience pays off here.
• Chill before serving. The frosting firms up in the fridge and the flavors develop more fully after a few hours.
• Do not over-mix the frosting. Gently fold the Cool Whip in. Aggressive stirring deflates it and makes the frosting runny.

What to Serve Alongside

Watergate Cake is wonderful on its own, but it pairs perfectly with a cup of hot coffee or a glass of cold milk. For holidays, serve it alongside other retro favorites like ambrosia salad or a pineapple upside-down cake.

For an extra special presentation, top each slice with a small dollop of whipped cream and a few whole pistachios.

How to Store Leftovers

Cover the cake tightly and store in the refrigerator for up to 4 days. Keep it chilled at all times because of the Cool Whip frosting.

Freezing is not recommended since the whipped frosting does not thaw well. If you want to freeze the cake, do so without the frosting and add it fresh after thawing.

Print Pin

4.90 from 3 votes

Watergate Cake

Prep Time 15 minutes minutes

Cook Time 35 minutes minutes

Total Time 50 minutes minutes

Servings 12 slices

Author Josephine

Ingredients

• 1 box white cake mix 15.25 oz
• 1 box pistachio instant pudding mix 3.4 oz
• 3 large eggs
• 1 cup club soda
• 1/2 cup vegetable oil
• 1/2 cup chopped pecans plus more for topping
• 1 box pistachio instant pudding mix 3.4 oz, for frosting
• 1 container Cool Whip 8 oz, thawed
• 1 cup whole milk cold

Instructions

• Preheat the oven to 350°F. Grease and flour a 9x13-inch baking pan.
• In a large bowl, combine the white cake mix, one box of pistachio pudding mix, eggs, club soda, and vegetable oil. Beat with an electric mixer for 2 minutes until smooth.
• Fold in 1/2 cup of chopped pecans. Pour the batter into the prepared pan.
• Bake for 30 to 35 minutes, or until a toothpick inserted in the center comes out clean. Let cool completely.
• For the frosting, whisk together the second box of pistachio pudding mix and cold milk for 2 minutes until thickened. Fold in the thawed Cool Whip until smooth and fluffy.
• Spread the frosting over the cooled cake and sprinkle with extra chopped pecans. Refrigerate for at least 1 hour before serving.

Notes

The pistachio pudding mix gives the cake its signature green color and nutty flavor. Do not substitute regular pudding.

Final Thoughts

This Watergate Cake is vintage baking at its absolute finest. The light pistachio flavor, the fluffy whipped frosting, and those crunchy pecans create something truly special that never goes out of style.

It is effortless to make, gorgeous to look at, and guaranteed to get rave reviews. If you have never tried this classic, now is the time.