Slow Cooker Peanut Butter Cup Swirl Cake
If you’re a fan of desserts that give you that warm, comforting feeling, then this Slow Cooker Peanut Butter Cup Swirl Cake is right up your alley. Imagine a rich, moist cake infused with creamy peanut butter and dotted with sweet peanut butter cups, all made effortlessly in your slow cooker. This recipe combines the convenience of slow cooking with the indulgence of a classic peanut butter dessert. Perfect for gatherings, family dinners, or just satisfying your own sweet tooth, this cake is sure to become a favorite in your dessert repertoire.
What Sets This Recipe Apart

What makes this Slow Cooker Peanut Butter Cup Swirl Cake truly special is its ease of preparation and the delightful combination of flavors and textures. The slow cooker allows the cake to become wonderfully moist while the peanut butter cups melt into gooey pockets of goodness. Plus, the rich peanut butter frosting drizzled on top takes it to another level of deliciousness.
What to Buy
To make this scrumptious cake, you’ll need the following ingredients:
- 1 15.25-ounce box yellow cake mix
- 1 cup water
- 3 large eggs
- heaping 1/2 cup creamy peanut butter
- 1/2 cup unsalted butter, softened
- 1/2 cup hot fudge sauce (not thin chocolate sauce)
- 1 cup confectioners’ sugar
- 1/4 cup creamy peanut butter (for frosting)
- 1/4 cup cream or milk, plus more as necessary for consistency
- 1/4 cup hot fudge (for frosting)
- 20 peanut butter cups miniatures, unwrapped and cut in half (minis may be substituted)
Cook’s Kit
Before you start, make sure you have these essential tools:
- Slow Cooker: A standard 6-quart slow cooker works perfectly for this recipe.
- Mixing Bowls: Use various sizes for mixing ingredients and preparing the frosting.
- Measuring Cups and Spoons: Accurate measurements are key for baking perfection.
- Spatula: To scrape down the sides of your bowl and ensure everything is well combined.
- Whisk or Electric Mixer: For mixing the batter and frosting until smooth.
Directions: Slow Cooker Peanut Butter Cup Swirl Cake

Step 1: Prepare the Cake Batter
In a large mixing bowl, combine the yellow cake mix, water, eggs, and heaping 1/2 cup of creamy peanut butter. Using a whisk or electric mixer, blend everything together until smooth. Make sure there are no lumps, and everything is well incorporated.
Step 2: Add the Fudge
Gently fold in the hot fudge sauce into the cake batter. You want to create a marbled effect, so don’t over mix. Just swirl it in until it’s combined but still has visible streaks of fudge.
Step 3: Prepare the Slow Cooker
Grease the inside of your slow cooker with a little butter or non-stick spray. This will help prevent sticking and make it easier to remove the cake later.
Step 4: Pour and Layer
Pour half of the cake batter into the slow cooker. Then, sprinkle half of the halved peanut butter cups over the batter. Pour the remaining batter on top and finish with the rest of the peanut butter cups.
Step 5: Cook the Cake
Cover the slow cooker with its lid and set it to low. Allow the cake to cook for about 3 to 4 hours. The cake is done when it is set in the center and a toothpick inserted comes out clean.
Step 6: Make the Frosting
While the cake is cooking, prepare the frosting. In a mixing bowl, combine the confectioners’ sugar, 1/4 cup creamy peanut butter, 1/4 cup cream or milk, and 1/4 cup hot fudge. Mix until smooth and creamy. Add more cream or milk if necessary to reach your desired consistency.
Step 7: Serve and Enjoy
Once the cake is done, turn off the slow cooker and let it cool slightly. Use a spatula to carefully lift the cake out. Drizzle the peanut butter fudge frosting over the warm cake and serve. Enjoy it warm or at room temperature.
Variations by Season

This Slow Cooker Peanut Butter Cup Swirl Cake can easily be adapted to fit different seasons and occasions:
- Fall: Add a pinch of cinnamon and nutmeg to the batter for a warm, spiced flavor.
- Winter: Incorporate crushed peppermint candies into the frosting for a festive twist.
- Spring: Serve with fresh berries on the side for a refreshing contrast.
- Summer: Top with a scoop of vanilla ice cream for a decadent dessert.
Pro Perspective
- Using a quality peanut butter is key; choose one that is smooth and creamy for the best results.
- For an extra layer of flavor, try adding a splash of vanilla extract to the cake batter.
- Don’t skip the frosting! It adds a rich, sweet finish that perfectly complements the cake.
- If you’re short on time, you can use store-bought frosting instead of making your own.
Meal Prep & Storage Notes
This Slow Cooker Peanut Butter Cup Swirl Cake is perfect for meal prep. It can be made ahead of time and stored. Here are some tips:
- Store leftover cake in an airtight container at room temperature for up to 3 days.
- For longer storage, keep the cake in the refrigerator, where it will last up to a week.
- You can also freeze the cake! Wrap it tightly in plastic wrap and then in aluminum foil. It will keep well in the freezer for up to 3 months.
- To reheat, simply microwave individual slices for about 15-20 seconds or warm it in the oven at a low temperature.
Quick Questions
Can I make this cake in an oven instead of a slow cooker?
Yes, you can bake this cake in a preheated oven at 350°F (175°C) for about 25-30 minutes or until a toothpick comes out clean. Adjust the baking time based on your oven.
What can I substitute for the yellow cake mix?
You can use a homemade cake mix by combining flour, sugar, baking powder, and salt, then adding the wet ingredients as specified in the recipe.
Can I use crunchy peanut butter instead of creamy?
Absolutely! Using crunchy peanut butter will add texture to the cake, enhancing the peanut butter flavor.
Is it okay to leave the cake out overnight?
Yes, the cake can be left out at room temperature for one night. Just make sure it is covered to keep it fresh.
Ready to Cook?
If you’re ready to indulge in this delightful dessert, gather your ingredients and let your slow cooker do the magic. The combination of peanut butter and chocolate in this Slow Cooker Peanut Butter Cup Swirl Cake is a surefire way to impress your family and friends. Enjoy every bite and share the love of baking!

Slow Cooker Peanut Butter Cup Swirl Cake
Ingredients
Equipment
Method
- In a large mixing bowl, combine the yellow cake mix, water, eggs, and heaping 1/2 cup of creamy peanut butter. Using a whisk or electric mixer, blend everything together until smooth.
- Gently fold in the hot fudge sauce into the cake batter. You want to create a marbled effect, so don’t over mix.
- Grease the inside of your slow cooker with a little butter or non-stick spray.
- Pour half of the cake batter into the slow cooker. Then, sprinkle half of the halved peanut butter cups over the batter. Pour the remaining batter on top and finish with the rest of the peanut butter cups.
- Cover the slow cooker with its lid and set it to low. Allow the cake to cook for about 3 to 4 hours.
- While the cake is cooking, prepare the frosting. In a mixing bowl, combine the confectioners' sugar, 1/4 cup creamy peanut butter, 1/4 cup cream or milk, and 1/4 cup hot fudge. Mix until smooth and creamy.
- Once the cake is done, turn off the slow cooker and let it cool slightly. Drizzle the peanut butter fudge frosting over the warm cake and serve.
Notes
- Store leftover cake in an airtight container at room temperature for up to 3 days.
- For longer storage, keep the cake in the refrigerator, where it will last up to a week.
- You can also freeze the cake! Wrap it tightly in plastic wrap and then in aluminum foil. It will keep well in the freezer for up to 3 months.
