There's something irresistibly comforting about a warm, fudgy brownie, especially when it’s just for you. I often find myself longing for a sweet treat, but who has the time to bake a full batch? That's when I discovered this gem of a recipe for an Easy and Simple Peanut Butter Brownie in a Cup. In just one minute-yes, you heard that right-you can create your very own decadent dessert without the hassle of an oven.
Imagine the rich aroma of chocolate wafting through your kitchen, mingling perfectly with the creamy delight of peanut butter. Whether it’s a late-night craving or a midday pick-me-up, this single-serving brownie is not only quick to whip up but also offers endless possibilities for personalization. Top it with a scoop of ice cream, a sprinkle of nuts, or simply savor the rich, gooey goodness on its own. Trust me, this mug brownie is about to become your new go-to indulgence!

Why choose Easy and Simple Peanut Butter Brownie in a Cup?
Simplicity: This recipe is a breeze, requiring minimal effort and ingredients.
Decadent Flavor: The combination of rich chocolate and creamy peanut butter creates a taste explosion that dessert lovers crave.
Microwave Magic: Ready in just one minute, it's perfect for those who need a quick fix without the oven.
Personalized Treat: Customize it with your favorite toppings, like nuts or whipped cream, for a unique twist each time.
Single Serving Satisfaction: Enjoy this indulgent treat without the temptation of leftovers calling your name!
Crowd-Pleasing: Whether for a late-night snack or a sweet surprise, this brownie in a cup is sure to impress anyone with a sweet tooth!
Easy and Simple Peanut Butter Brownie in a Cup Ingredients
For the Brownie Base
• Sugar - Sweetness is crucial; opt for granulated sugar or a sugar substitute like Splenda for a healthier option.
• All-Purpose Flour - Provides structure; measure carefully to avoid dense brownies.
• Pinch of Salt - Enhances the rich chocolate flavor beautifully.
• Cocoa Powder - Delivers richness; use dark cocoa like Hershey’s for deeper taste.
• Vegetable Oil - Adds moisture and fat for that fudgy texture; can replace with melted butter or olive oil.
• Water - Necessary for hydrating the batter.
• Vanilla Extract - A splash to enhance overall flavor.
• Peanut Butter (optional) - Introduces a nutty richness that pairs perfectly with chocolate; can be omitted if allergic.
Enjoy your warm bowl of Easy and Simple Peanut Butter Brownie in a Cup, topped with your favorite indulgences!
How to Make Easy and Simple Peanut Butter Brownie in a Cup
Combine Dry Ingredients: In a large (12 oz. or larger) microwave-safe mug, mix sugar, flour, salt, and cocoa powder thoroughly until well combined for a uniform taste.
Add Wet Ingredients: Pour in the vegetable oil, water, and vanilla extract. Stir gently until smooth and creamy, ensuring there are no lumps in the batter.
Incorporate Peanut Butter: If using, scoop a tablespoon of peanut butter and gently push it into the center of the batter for a delightful surprise.
Microwave the Brownie: Cook the mug in the microwave on high for 60 seconds for a chewy brownie. If you prefer a cake-like texture, add an extra 10 seconds, but keep an eye on it!
Cool and Enjoy: Let the brownie cool for a couple of minutes. Dive right in with a spoon, enjoying it directly from the mug for a cozy treat.
Optional: Try adding a drizzle of chocolate sauce or a dollop of whipped cream on top for extra indulgence!
Exact quantities are listed in the recipe card below.

How to Store and Freeze Easy and Simple Peanut Butter Brownie in a Cup
Best Enjoyed Fresh: This brownie is best enjoyed right after preparation for that warm, gooey experience.
Room Temperature: If you have leftovers, store them in an airtight container at room temperature for up to 2 days.
Refrigeration: For slightly longer storage, you can refrigerate the brownie for up to 3 days; just make sure to let it come to room temperature before enjoying.
Freezing: Although this treat is ideal fresh, you can freeze the brownie in an airtight container for up to 1 month. Reheat in the microwave for a quick indulgence!
Variations & Substitutions for Easy and Simple Peanut Butter Brownie in a Cup
Feel free to get creative with this recipe and customize it to your taste, transforming each bite into something uniquely yours!
- Nut-Free: Replace peanut butter with sunflower seed butter for a delicious, allergy-friendly option.
- Vegan Delight: Use a plant-based yogurt instead of vegetable oil for a dairy-free treat that still packs a fudgy punch.
- Chocolate Chip Boost: Fold in a handful of chocolate chips for added sweetness and rich texture throughout the brownie.
- Spicy Twist: Add a pinch of cayenne pepper or a sprinkle of cinnamon to the batter for an unexpected flavor kick.
- Fruit Flavor: Toss in some fresh or frozen berries before microwaving for a fruity surprise in every spoonful.
- Decadent Topping: After microwaving, top with a drizzle of caramel or chocolate sauce for an irresistible finishing touch.
- Gooey Center Alternative: Instead of peanut butter, place a square of chocolate or a caramel candy in the center before microwaving for an extra gooey core.
- Grain-Free Option: Swap all-purpose flour with almond flour for a gluten-free version that doesn't skimp on flavor.
With these variations, your easy and simple peanut butter brownie in a cup will become the ultimate personalized dessert!
Expert Tips for Easy and Simple Peanut Butter Brownie in a Cup
Right Mug Size: Use a mug that's 12 oz. or larger to prevent overflow during microwaving; avoid messy cleanups!
Perfect Timing: Adjust microwaving time based on wattage; start with 60 seconds, then add 10 seconds for a firmer texture if desired.
Cool Down: Let the brownie sit for a few minutes after cooking; this enhances its fudginess and makes it easier to enjoy.
Flavor Boost: Personalize your Easy and Simple Peanut Butter Brownie in a Cup with nuts or chocolate chips; add them before microwaving for extra texture.
Ingredient Prep: For quicker preparation, pre-mix dry ingredients ahead of time and store them in baggies. Just add wet ingredients when you’re ready to indulge.
Make Ahead Options
These Easy and Simple Peanut Butter Brownie in a Cup are perfect for busy home cooks who want to save time during weeknights! You can prepare the dry ingredients (sugar, flour, salt, cocoa powder) and store them in a sealed bag or container up to 24 hours ahead of time. When you’re ready to enjoy your brownie, simply add the wet ingredients, including vegetable oil and water, to the prepared mix, stir, and microwave as instructed. For the best results, avoid adding the peanut butter until you’re about to cook it, as this keeps it fresh and creamy. With these simple steps, you can have a satisfying dessert ready in just minutes-just as delicious but with half the effort!
What to Serve with Easy and Simple Peanut Butter Brownie in a Cup?
Pairing scrumptious sides with your mug brownie can elevate your dessert experience to new heights, making every bite a celebration!
Vanilla Ice Cream: The creamy sweetness of vanilla ice cream beautifully contrasts the warm, fudgy brownie for a classic combination.
Whipped Cream: A dollop of fluffy whipped cream adds a light touch and enhances the dessert's indulgence, making each spoonful delightfully rich.
Fresh Berries: Raspberries or strawberries offer a tangy burst that complements the sweetness of the brownie, adding both flavor and color to your plate.
Chocolate Sauce: Drizzle warm chocolate sauce on top for an extra dose of decadence. It intensifies the chocolate flavor and creates a luscious finish.
Nuts: Sprinkle chopped walnuts or pecans over the brownie for a crunchy texture that contrasts perfectly with its soft and gooey center.
Coffee or Espresso: Pairing your brownie with a cup of coffee elevates the experience, balancing the sweetness while enhancing the rich chocolate flavor.
Enjoying these treats alongside your Easy and Simple Peanut Butter Brownie in a Cup will undoubtedly make for a delightful dessert experience.

Easy and Simple Peanut Butter Brownie in a Cup Recipe FAQs
What type of sugar is best for this recipe?
You can use granulated sugar for sweetness, but if you’re looking to reduce calories, a sugar substitute like Splenda works just as well. Both options yield a deliciously sweet brownie, so choose what fits your dietary needs!
How should I store leftovers of the brownie?
This brownie is best enjoyed fresh, but if you have leftovers, place them in an airtight container at room temperature for up to 2 days. If you prefer chilled brownies, you can refrigerate them for up to 3 days; remember to let it come to room temperature before enjoying!
Can I freeze my Easy and Simple Peanut Butter Brownie in a Cup?
Absolutely! To freeze, allow the brownie to cool completely, then wrap it tightly in plastic wrap or place it in an airtight container. It will keep well in the freezer for up to 1 month. When you're ready to indulge, reheat it in the microwave for about 30 seconds to enjoy that warm, gooey goodness again!
What if my brownie overflows in the microwave?
If your brownie spills over, don't fret! This can happen if the mug is too small. For next time, use a larger (12 oz. or bigger) mug to give your brownie room to rise. If it does overflow, just clean your microwave promptly for an easier cleanup.
Is there a way to make this brownie eggless?
Yes! This recipe is naturally eggless, making it perfect for those avoiding eggs. The combination of ingredients-sugar, flour, cocoa powder, and liquid-creates a fudgy texture without the need for eggs, so you can enjoy guilt-free!
Are there any allergen concerns with this recipe?
Definitely consider allergies, especially with peanuts. If you or anyone you're serving has a peanut allergy, simply omit the peanut butter. You can also replace it with alternatives like sun butter to ensure everyone can indulge in this delicious treat!

Irresistibly Easy Peanut Butter Brownie in a Cup Recipe
Ingredients
Equipment
Method
- In a large microwave-safe mug, mix sugar, flour, salt, and cocoa powder thoroughly until well combined.
- Pour in the vegetable oil, water, and vanilla extract. Stir gently until smooth and creamy.
- If using, scoop a tablespoon of peanut butter and gently push into the center of the batter.
- Cook the mug in the microwave on high for 60 seconds for a chewy brownie.
- Let the brownie cool for a couple of minutes before enjoying.

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