5-Ingredient Peanut Butter Mug Cake
If you’re looking for a quick and delightful dessert that satisfies your sweet tooth, look no further than this 5-Ingredient Peanut Butter Mug Cake. This easy-to-make treat combines the rich flavors of creamy peanut butter and chocolate, all in the convenience of a microwave mug. With just five ingredients, you can whip this up in no time, making it the perfect solution for late-night cravings or a quick afternoon pick-me-up.
Why This Recipe Is Reliable

This 5-Ingredient Peanut Butter Mug Cake is not only simple but also incredibly reliable. The recipe is designed for success with minimal fuss. The ingredients are easy to find, and the method requires very little equipment. Plus, this mug cake is customizable, allowing you to adjust flavors and toppings based on your preferences. Whether you’re a baking novice or a seasoned pro, this cake is bound to impress.
Ingredient Rundown
- 3 Tbsp (24g) all-purpose flour: This forms the base of your cake, providing structure and helping it rise.
- 1/4 tsp baking powder: A crucial leavening agent that gives your mug cake that fluffy texture.
- 1 Tbsp (15ml) pure maple syrup: This natural sweetener adds a hint of sweetness and moisture.
- 2 Tbsp (30ml) creamy peanut butter: The star of the show, bringing rich flavor and creaminess to the cake.
- 4 Tbsp (60ml) milk of choice: Helps combine the ingredients and creates a moist cake. Use any milk you prefer, whether dairy or non-dairy.
- 1 tsp avocado oil (optional): This adds extra moisture, though it can be omitted if desired.
- Pinch sea salt: Enhances the flavor of the peanut butter and balances sweetness.
- 1 to 2 Tbsp semi-sweet chocolate chips: For those who love a chocolatey twist.
- 1/2 tsp pure vanilla extract: Adds a beautiful depth of flavor.
- 1/4 tsp ground cinnamon: A warm spice that complements the peanut butter perfectly.
Prep & Cook Tools
- Mug: A microwave-safe mug is essential for baking your cake.
- Mixing spoon: A simple spoon is perfect for mixing the ingredients together.
- Measuring spoons: Accurate measurements are key to achieving the best results.
- Microwave: The star appliance that will cook your mug cake in just one minute!
From Start to Finish: 5-Ingredient Peanut Butter Mug Cake

Step 1: Gather Your Ingredients
Start by collecting all your ingredients and tools. This ensures you have everything on hand and makes the process smooth.
Step 2: Mix Dry Ingredients
In your mug, combine the all-purpose flour, baking powder, sea salt, and ground cinnamon. Stir them together until well mixed.
Step 3: Add Wet Ingredients
Add in the pure maple syrup, creamy peanut butter, milk, and vanilla extract. If you choose to use it, add the avocado oil now. Mix everything until you have a smooth batter.
Step 4: Fold in Chocolate Chips
Gently fold in the semi-sweet chocolate chips. This adds a delightful melty texture to your mug cake.
Step 5: Microwave
Place the mug in the microwave and cook on high for about 1 minute. Keep an eye on it to prevent overflow. Depending on your microwave’s wattage, you may need to adjust the cooking time slightly.
Step 6: Enjoy!
Once cooked, let it cool for a minute, then dig in! Enjoy your 5-Ingredient Peanut Butter Mug Cake straight from the mug or transfer it to a plate for a more polished presentation.
Seasonal Ingredient Swaps

- Nut Butter: Swap the peanut butter for almond or cashew butter for a different nutty flavor.
- Sweetener: Use honey or agave syrup instead of maple syrup for a change in sweetness.
- Milk: Substitute with coconut milk or oat milk for a unique twist.
- Add-ins: Toss in some chopped nuts or dried fruit for additional texture and flavor.
Troubles You Can Avoid
- Overmixing: Mix just until combined to prevent a dense cake.
- Microwave Timing: Every microwave is different; start with 1 minute and add more time if needed.
- Ingredient Measurements: Be precise with your measurements for best results.
- Cooling Time: Let it cool for a minute before eating to avoid burning your mouth.
Storing, Freezing & Reheating
The 5-Ingredient Peanut Butter Mug Cake is best enjoyed fresh, but you can store leftovers in an airtight container in the fridge for up to 2 days. If you want to freeze it, let the cake cool completely, then wrap it tightly in plastic wrap and store it in a freezer-safe bag for up to a month. To reheat, simply microwave for 20-30 seconds until warmed through.
Questions People Ask
Can I make this mug cake vegan?
Yes, you can easily make this mug cake vegan by using plant-based milk and a vegan-friendly sweetener like maple syrup or agave syrup.
Can I double this recipe?
While this recipe is designed for a single serving, you can double it and bake it in a larger microwave-safe bowl. Just be sure to adjust the cooking time accordingly!
What if I don’t have a microwave?
If you don’t have a microwave, you can bake this mug cake in a preheated oven at 350°F (175°C) for about 15-20 minutes in an oven-safe ramekin, checking for doneness with a toothpick.
Can I add more ingredients?
Absolutely! Feel free to customize your mug cake with additional ingredients like shredded coconut, crushed graham crackers, or even a dollop of yogurt on top.
Let’s Eat
With just five simple ingredients, the 5-Ingredient Peanut Butter Mug Cake brings joy and indulgence in a matter of minutes. Whether you’re treating yourself after a long day or surprising a friend with a sweet gift, this mug cake is sure to satisfy. So grab your mug, mix it up, and get ready to indulge in your new favorite quick dessert!

5-Ingredient Peanut Butter Mug Cake
Ingredients
Equipment
Method
- Gather your ingredients and tools to ensure a smooth process.
- In your mug, combine the all-purpose flour, baking powder, sea salt, and ground cinnamon. Stir until well mixed.
- Add in the pure maple syrup, creamy peanut butter, milk, and vanilla extract. If using, add the avocado oil now. Mix until you have a smooth batter.
- Gently fold in the semi-sweet chocolate chips.
- Place the mug in the microwave and cook on high for about 1 minute, adjusting time as needed.
- Let it cool for a minute, then enjoy your mug cake!
Notes
- Mix just until combined to avoid a dense cake.
- Microwave times may vary; start with 1 minute and adjust as needed.
- Store leftovers in an airtight container in the fridge for up to 2 days.
