Craving something sweet but don’t want to bake an entire cake? 😍 This 3 Ingredient Peanut Butter Mug Cake is the perfect solution! With only three pantry staples and less than 2 minutes of cooking time, you’ll have a warm, fluffy, peanut butter dessert that’s perfect for one. ☕

This recipe is naturally flourless, incredibly easy, and perfect for busy weeknights, late-night cravings, or a quick afternoon treat. ❤️

✨ Why You’ll Love This Peanut Butter Mug Cake

✅ Only 3 simple ingredients
⏱️ Ready in about 2 minutes
🥜 Rich peanut butter flavor
💪 High in protein thanks to the egg and peanut butter
🍰 Perfect single-serving dessert
🎉 Easy to customize with your favorite toppings

🛒 Ingredients

You’ll only need:

🥚 1 large egg, beaten
🥜 3 tablespoons peanut butter
🍯 1 tablespoon brown sugar

🍴 Equipment

• ☕ Microwave-safe mug (10–12 oz)
• 🍴 Small fork or whisk
• 🥄 Spoon

👩‍🍳 How to Make a 3 Ingredient Peanut Butter Mug Cake

🥚 Step 1: Beat the Egg

Crack the egg into a small bowl or directly into your microwave-safe mug. Beat until smooth.

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🥜 Step 2: Add Peanut Butter

Add the peanut butter and stir until completely combined.

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🍯 Step 3: Mix in Brown Sugar

Add the brown sugar and continue mixing until the batter is smooth and creamy.

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⚡ Step 4: Microwave

Microwave on High for 45–60 seconds.

⏱️ Microwave Guide

• 🔹 700W: 60–70 seconds
• 🔹 900W: 50–60 seconds
• 🔹 1000–1200W: 40–50 seconds

The cake should be set on top while remaining soft and moist inside. 😋

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🍰 Step 5: Cool Slightly

Let the mug cake cool for 1 minute before digging in!

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💡 Tips for the Best Mug Cake

✔️ Use creamy peanut butter for the smoothest texture.

✔️ Don’t overcook—it can become rubbery.

✔️ Mix thoroughly so there are no streaks of egg.

✔️ Use a larger mug to prevent overflowing.

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🍫 Delicious Topping Ideas

Take your mug cake to the next level with:

🍫 Chocolate chips

🍦 Vanilla ice cream

🥜 Chopped peanuts

🍯 Honey drizzle

🍌 Banana slices

🍓 Strawberry jam

🍮 Caramel sauce

☁️ Whipped cream

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🧊 Storage

This mug cake tastes best fresh out of the microwave. 😍

If needed:

🥡 Refrigerate leftovers for up to 24 hours.

♨️ Reheat for 10–15 seconds before serving.

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🌟 Variations

🍫 Chocolate Peanut Butter Mug Cake

Mix in 1 tablespoon of chocolate chips before microwaving.

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🍌 Banana Peanut Butter Mug Cake

Top with fresh banana slices after cooking.

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🥜 Crunchy Peanut Butter Version

Use crunchy peanut butter for extra texture.

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🍯 Extra Sweet

Drizzle with honey or maple syrup before serving.

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❓ Frequently Asked Questions

🥜 Can I use natural peanut butter?

Yes! Just stir it well first since the oil tends to separate.

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🍚 Can I use white sugar?

Absolutely! White sugar works just as well.

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⚠️ Why is my mug cake rubbery?

It was likely microwaved too long. Start with 45 seconds and add extra time in 5–10 second intervals if needed.

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🔥 Can I bake it instead?

Yes! Pour the batter into an oven-safe ramekin and bake at 350°F (175°C) for about 10–12 minutes, or until set.

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🥗 Nutrition (Approximate)

Per serving:

🔥 Calories: 340–380

💪 Protein: 16 g

🍞 Carbohydrates: 14 g

🥜 Fat: 26 g

🍬 Sugar: 11 g

Nutrition values are approximate and may vary depending on the peanut butter brand.

📝 Quick Recipe Card

🥜 Ingredients

• 🥚 1 beaten egg
• 🥜 3 tbsp peanut butter
• 🍯 1 tbsp brown sugar

👨‍🍳 Instructions

1️⃣ Beat the egg.

2️⃣ Stir in the peanut butter until smooth.

3️⃣ Mix in the brown sugar.

4️⃣ Microwave for 45–60 seconds.

5️⃣ Let cool for 1 minute.

6️⃣ Enjoy! 😋

❤️ Final Thoughts

This 🥜 3 Ingredient Peanut Butter Mug Cake proves that delicious desserts don’t need a long ingredient list or complicated techniques. In just a couple of minutes ⏱️, you can enjoy a warm, soft, peanut butter cake made with everyday ingredients. Whether you enjoy it plain, topped with 🍫 chocolate, 🍌 fruit, or 🍦 ice cream, it’s an easy recipe you’ll want to make again and again! ✨