Vegan Peanut Butter Wacky Cake

This vegan peanut butter wacky cake is a dream cake for all you peanut butter lovers! This cake and frosting are loaded with lots of peanut butter! You’ll love this light and fluffy peanut butter cake made with minimal ingredients (because it’s based on the Depression-era Wacky Cake). Make this flavorful cake today!

A slice of vegan peanut butter wacky cake sits on a plate with the rest of the cake behind it and more peanut butter frosting in a bowl.
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Lately I’ve been into making fun, easy vegan desserts. The latest on my list is this Vegan Peanut Butter Wacky Cake. If you remember, I recently shared this Vegan Chocolate Wacky Cake.

And then I’ve got a recipe that includes both chocolate and peanut butter in one cake: Vegan Chocolate Peanut Butter Crunch Cake.

Sometimes I want to make a cake recipe that isn’t two layers and isn’t some big sheet cake. So making this simple cake, in one round cake pan, is perfect.

A slice of vegan peanut butter wacky cake sits on a plate.

Why You’ll Love Vegan Peanut Butter Wacky Cake

Finding a recipe that is both easy and delicious is not always achievable. However, this Vegan Peanut Butter Wacky Cake, meets both criteria and a couple of others as well, such as affordable, and irresistible!

This recipe makes one round cake pan. What I love about this is that you can enjoy a slice or two with your friends or family, and not worry that you’ll eat too much of it. Not that anyone would worry about a thing like that. 🙂

You’ll also love that this Vegan Peanut Butter Wacky Cake is:

  • Moist
  • Peanut Buttery
  • Delicious
  • Perfect for a weeknight or weekend treat!

You can even make two and turn it into a layer cake. I just happen to really love the simpleness of a single layer round cake. It’s perfection!

How to Make This Wacky Cake

The wacky cake originated in the Depression-era when ingredients were in short demand. Creative cooks took what ingredients were available and made do. Interesting enough, dairy products were one of those scarce ingredients, which is why the wacky cake became a vegan go-to recipe (even before veganism was cool!).

Follow along with the video for my vegan chocolate wacky cake featured on this page to see steps on how to make a wacky cake.

An uncut peanut butter wacky cake sits on a plate with more peanut butter frosting in a bowl behind it.

We hope you enjoy this Vegan Peanut Butter Wacky Cake as much as we do! If you decide to mae the recipe snap a photo and use #namelymarly on Instagram. We love seeing your photos!

Vegan Peanut Butter Wacky Cake - such a simple dessert recipe with delicious flavor!

Peanut Butter Wacky Cake Recipe

Take a bite out of this Vegan Peanut Butter Wacky Cake. With minimal ingredients, this moist cake is ready to please in around 30 minutes!
5 from 3 votes
Print Pin Rate
Course: Dessert
Cuisine: American
Keyword: Peanut Butter Wacky Cake Recipe
Prep Time: 5 minutes
Cook Time: 30 minutes
Total Time: 35 minutes
Servings: 9
Calories: 282kcal
Author: Namely Marly


  • cups all-purpose flour
  • 1 cup granulated sugar
  • ½ cup peanut butter powder
  • ½ teaspoon salt
  • 1 teaspoon baking soda
  • 1/3 cup vegetable oil
  • 1 cup cold water
  • 1 tablespoon apple cider vinegar
  • 1 teaspoon vanilla
  • Powdered sugar of Peanut Butter Frosting (see belofor topping


  • Heat your oven to 350F. Spray a round cake pan with vegetable spray. You can also place a piece of parchment paper at the bottom of the pan and spray the sides with vegetable oil.
  • Combine in a large mixing bowl the flour, sugar, peanut butter powder, salt and baking soda. Stir to combine.
  • In a smaller bowl combine the vegetable oil, water, vinegar and vanilla. Stir to combine.
  • Pour the water mixture into the flour mixture. Stir until combined.
  • Pour the batter into your prepared pan. Bake for 30-35 minutes until a toothpick inserted in the middle comes out clean.
  • Allow the cake to cool for about 10 minutes before inverting onto a serving plate. Sprinkle the top with powdered sugar or top with Peanut Butter Frosting*


*Make peanut butter frosting by combining 2 tablespoons peanut butter, 1 cup powdered sugar and 2 tablespoons peanut butter powder. Stir to combine. It will be crumbly. Add 1 teaspoon vanilla-flavored plant-based milk. Stir to combine. Continue adding 1 teaspoon of plant-based milk at a time until you get a spreadable consistency.

Here’s some other favorite vegan peanut butter cake recipes:

Whatever peanut butter treat you’re nibbling on, enjoy!

Updated by Marly · Permalink