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Molten Peanut Butter Lava Fudge Mug Cake

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If you’re craving a rich, gooey dessert but don’t want to wait, this Molten Peanut Butter Lava Mug Cake is the answer! Ready in just 5 minutes, this easy microwave mug cake combines the irresistible flavors of chocolate and peanut butter with a molten lava center.

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It’s the perfect single-serve dessert when you need a quick chocolate fix, with a light, fudgy texture thanks to whipped cream folded right into the batter. Move over chocolate lava cake—this decadent peanut butter mug cake will be your new favorite treat!

Mug cakes have long been a favorite on our site and this simple throw together molten peanut butter mug cake is so quick and easy, you’ll add it to your list of favorites too!
molten-peanut-butter-lava-fudge-mug-cake

For this recipe we use homemade whipped cream, it’s actually very easy to make your own with this wonderful whipped cream dispenser to ensure you’re using real cream rather than an oil-based dairy substitute.

To use the homemade whipped cream maker, all you need to do is pour in fresh whipping cream, add 1 or 2 drops of vanilla extract, screw on the top, apply the N20 gas cartridge, give it a good shake until the can feels nice and cold in your hand, and invert and squeeze trigger.

Molten Peanut Butter Lava Fudge Mug Cake

Having said that, any store-bought (real dairy) whipped cream in a can would likely work just fine.

Molten Peanut Butter Lava Fudge Mug Cake Video

How to Make Peanut Butter Lava Fudge Cake

You’ll Need:
non-stick cooking spray
1 heaping spoonful of Peanut Butter
Whipped Cream (already whipped, not liquid)
1 Large Egg
1/2 cup Chocolate Fudge Brownie Mix, (Dry)

  1. Spray the inside of a microwave-safe mug with non-stick cooking spray (be liberal about it!).
  2. Crack an egg into the mug, add the brownie mix, fill the remaining space in the mug with whipped cream- about 1/2-2/3 of a cup.
  3. Mix with a fork until completely blended.
  4. Add a generous dollop of peanut butter to the batter, about a rounded tablespoon.
  5. Microwave on high for 1 minute, and 10 seconds, exactly.
  6. Remove the cake from the microwave and immediately invert the cake onto a serving dish.
  7. molten peanut butter lava cake 3

  8. Garnish with a touch of Whipped Cream & serve immediately.

Single Serve Molten Lava cake dessert in less than 4 minutes flat!

Who knew dessert could be so easy?!


💸 Budget101® Price Breakdown: Molten Peanut Butter Lava Fudge Mug Cake

Ingredient
Amount Used
Package Size
Full Package Cost
Used Cost
Dry Brownie Mix
½ cup (60g)
18.3 oz box (519g)
$1.24
$0.29
Large Egg
1 egg
12-count carton
$1.98
$0.17
Whipped Cream (already whipped, from dispenser)
½ cup
1 pint heavy cream (yields ~4 cups whipped)
$3.68
$0.46
Peanut Butter
1 tbsp
16 oz jar
$2.12
$0.10
Non-Stick Cooking Spray
Light coating
6 oz can
$2.48
$0.03

💸 Budget101® Price Breakdown for the Molten Peanut Butter Lava Fudge Mug Cake based on average Walmart prices (as of May 2025)


🧾 Total Used Cost: $1.05 per mug cake

Optional toppings (extra):

  • Additional whipped cream garnish → +$0.10
  • Chocolate drizzle or sprinkles → +$0.05

✅ This makes it an affordable single-serve dessert for just about $1—perfect for Budget101’s frugal kitchen hacks!


Tried this recipe? Mention @Budget101com or tag #Budget101


📌 Love this Easy Molten Peanut Butter Lava Fudge Mug Cake Recipe? Pin it!

Craving a quick chocolate fix? This Molten Peanut Butter Lava Fudge Mug Cake is rich, gooey, and ready in under 5 minutes! Made with whipped cream folded into brownie mix, it’s light, fudgy, and bursting with melty peanut butter. Perfect single-serve dessert—no oven needed! #mugcake #easyrecipe #peanutbutter #chocolate #quickdessert #microwavemugcake #lavafudge #budget101


🖨️ Print-Friendly Peanut Butter Lava Fudge Mug Cake Recipe

molten peanut butter lava cake 3 1 1
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Molten Peanut Butter Lava Fudge Mug Cake

Budget101.com by Melissa 'Liss' Burnell
Move over chocolate lava cake, because Molten Peanut Butter Lava Fudge Mug Cake is here! Enjoy the rich flavor of peanut butter and chocolate in this single-serve dessert.
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Prep Time 3 minutes
Cook Time 2 minutes
0 minutes
Total Time 5 minutes
Course Dessert
Cuisine American
Servings 1
Calories 744 kcal

Equipment

Ingredients
  

Instructions
 

  • Spray the inside of a microwave-safe mug with non-stick cooking spray (be liberal about it!).
    non-stick cooking spray
  • Crack an egg into the mug, add the brownie mix, fill the remaining space in the mug with whipped cream- about 1/2-2/3 of a cup.
    1 large Egg
    ½ cup Chocolate Fudge Brownie Mix, dry
    ½ cup Whipped Cream
  • Mix with a fork until completely blended. Add a generous dollop of peanut butter to the batter, about a rounded tablespoon.
    1 Tablespoon Peanut Butter
  • Microwave on high for 1 minute, 10 seconds.
  • Remove from microwave and immediately invert the cake onto a serving dish.

Equipment

10oz mini trifle bowl (as shown in video) or Lg Coffee Mug (12oz)
Fork
professional whipped cream dispenser
whipped cream dispenser (or canned whipped cream)
Microwave
Small serving plate (optional for inverting)
Recipe Size Alteration Note

If you altered the ingedients above by doubling or tripling the recipe, you may also need to change the pan/dish size and adjust the cooking/baking time.

Nutrition

Serving: 1gCalories: 744kcalCarbohydrates: 106gProtein: 15gFat: 29gSaturated Fat: 11gPolyunsaturated Fat: 2gMonounsaturated Fat: 11gTrans Fat: 1gCholesterol: 209mgSodium: 448mgPotassium: 166mgFiber: 1gSugar: 69gVitamin A: 476IUCalcium: 69mgIron: 4mgNet Carbs: 105g
Tried this recipe?Mention @Budget101com or tag #Budget101com!

🔗 Related Mug Cake Recipes You Might Love:
👉 Complete Mug Mix Index
👉Cinnamon Honey Bun Coffee Cake in a Mug
👉 Cake in a Mug
👉 3-2-1 Carrot Cake in a Mug

Melissa 'Liss' Burnell, Founder of Budget101

👩‍🍳 About the Author

Melissa “Liss” Burnell is the founder of Budget101.com, a trusted frugal living resource online since 2001. With over 25 years of hands-on experience in meal planning, debt reduction, and DIY homemaking, she’s helped millions of families live well for less.

A mother of two, Liss first made waves by cutting her family’s grocery bill to under $200/month—then teaching others how to do the same. She is the author of two bestselling ebooks on feeding a family on a tight budget, available on Amazon.

📚 Learn more on the About page, or connect with Liss on Pinterest, Instagram, or Facebook.

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