Slow Cooker Peanut Butter Brownies

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Slow Cooker Peanut Butter Brownies: Your slow cooker will turn these Reese’s cup filled brownies into a magically gooey and ultra fudgy dessert experience. You may also love our peppermint patty cookies!

In my opinion (and I think I’m in good company here) the only thing that makes a chocolate dessert better is the addition of peanut butter. Every holiday Reese’s cups and eggs and trees (and whatever other shape the marketers dream up) just jump into my grocery cart. They are the one candy I would truly say is a weakness for me.

As for my favorite dessert, I’m not sure I could narrow it down to just one, but fudgy (and gooey) brownies are definitely at the top of the list. I found my inspiration for these Slow Cooker Peanut Butter Brownies here. Traditional brownies turned into a peanut butter brownies dream!

two brownie sundaes on a table with milk

Why you’ll love this recipe:

  • starts with a box brownie mix
  • ultra fudgy and gooey
  • make ahead dessert for when you want to serve something warm and fresh
  • delicious with ice cream and extra reese’s

Can you make dessert in your slow cooker?

I decided it was past time to create a slow cooker dessert recipe. My slow cooker recipe section contains some of my most viewed and popular recipes. You’ll find Grandma’s Pork Chops, creamy potatoes and even a healthy chili recipe.

I’m obviously a big fan of using my slow cooker for main dish and even side dish recipes. But I hadn’t yet turned on my slow cooker to make a dessert. What took me so long? These slow cooker peanut butter brownies are just as simple to stir together as baking them in the oven but the slow cooker makes these brownies a warm and fudgy new cake experience. You could skip a scoop of ice cream on top but why would you?

ingredients for slow cooker peanut butter brownies

Ingredients for Slow Cooker Brownies

I love that this recipe starts with a brownie mix. We often have a box brownie mix that we had gotten on sale in the pantry. When you need something just a little bit different, this is what you want!

  • brownie mix
  • oil
  • water
  • eggs
  • reese’s
  • peanut butter
  • hot fudge
  • water

How to Make Brownies in the Slow Cooker

  • It’s important to grease the slow cooker. You don’t want the brownies to stick and they will if you don’t grease it with butter or spray it with cooking spray.
  • Mix up the brownie batter then add it to the slow cooker.
  • Next make your peanut butter fudge sauce and pour it overtop.
  • You’ll want to cook this on high for 2-3 hours. Don’t overcook it. You want the brownies ooey gooey and fudgy!
slow cooker peanut butter brownies with a spoon

How to Serve Slow Cooker Brownies

These brownies are best served warm with a scoop of ice cream on top. We recommend additional caramel, hot fudge and chopped Reese’s on top for an irresistible dessert.

close up of brownies and ice cream in a parfait dish

Serve in individual parfait cups for a fun treat!

peanut butter brownies with ice cream and reese's
peanut butter brownies with ice cream and reese's

Slow Cooker Peanut Butter Brownies

4.75 from 4 votes
Your slow cooker will turn these Reese’s cup filled brownies into a magically gooey and ultra fudgy dessert experience.
Servings 10
Prep Time 10 minutes
Cook Time 3 hours
Total Time 3 hours 10 minutes

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  • 1 box brownie mix I used Ghirardelli brand
  • 2/3 cup vegetable oil
  • ¼ cup water
  • 2 large eggs
  • 8 Reese’s cups chopped
  • 6 ounces hot fudge sauce
  • 1 tablespoon peanut butter
  • ½ cup hot water


  • ice cream
  • Reese's cups
  • hot fudge or peanut butter drizzle


  • Grease the inside of a 6-quart slow cooker with butter.
  • In a large bowl, whisk together the oil, ¼ cup of water and two eggs. Add the brownie mix and stir until combined. Add the chopped Reese’s cups and stir until combined.
  • Spread the brownie batter evenly in the bottom of the greased slow cooker.
  • In a separate bowl (or glass measuring cup), combine the hot fudge, peanut butter and remaining ½ cup of hot water. Whisk until smooth. Pour the sauce over the brownie mix in the slow cooker.
  • Place the lid on the slow cooker and cook on HIGH power for 2 to 3 hours (or until center of brownie is just set).
  • Serve warm topped with vanilla ice cream, chopped Reese's, and hot fudge or warmed peanut butter drizzle.


The calories shown are based on the brownies being divided 10 ways, with 1 serving being 1/10 of the recipe. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate.


Calories: 503kcal | Carbohydrates: 58g | Protein: 6g | Fat: 28g | Saturated Fat: 15g | Cholesterol: 38mg | Sodium: 278mg | Potassium: 119mg | Fiber: 1g | Sugar: 37g | Vitamin A: 60IU | Calcium: 25mg | Iron: 2mg
Course Dessert
Cuisine American
Calories 503
Keyword brownie mix idea, reeses brownies, slow cooker brownies, slow cooker dessert

Other Brownie Recipes


About JulieJulie Clark

About Julie Clark

I'm Julie Clark, CEO and recipe developer of Tastes of Lizzy T. With my B.A. in Education and over 30 years of cooking and baking, I want to teach YOU the best of our family recipes.

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4.75 from 4 votes (4 ratings without comment)
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Pete Mathis
3 years ago

What size brownie mix?

3 years ago

Do you think using a gluten-free brownie mix be okay?