Peanut Butter Mug Cake Recipe
I LOVE making single serve mug cakes, especially when I can make them work for my blood sugar, just like this easy peanut butter mug cake recipe!
I have tried different types of mug recipes, like a delicious lemon mug cake when I wanted a more tart citrus flavor, a brownie in a mug when I needed chocolate, and a fall pumpkin mug cake, so I figured I would try out some more recipes too!
This is a soft, warm, peanut buttery cake that is just sweet enough to feel like a real treat. Now it’s my go-to when I want something that feels like dessert but comes together faster than I can find the TV remote.
If you’ve never made a mug cake before, this easy peanut butter mug cake is the perfect place to start!
Benefits
Every ingredient in this recipe is doing something useful, and I love that it’s not a long list:
- All-purpose flour is the base that gives the cake its soft, cakey structure. You only need a quarter cup, which means this comes together fast and stays light instead of dense and heavy. (I’ve also used gluten free flour and whole wheat so feel free to swap it up!)
- Peanut butter is the real star here. It adds protein and healthy fats, which means this actually satisfies you instead of leaving you reaching for more five minutes later. It also gives the cake that rich, nutty flavor that makes the whole thing feel indulgent.
If you love peanut butter, you will also love this healthy peanut butter fudge or these protein peanut butter cookies too!
I once mixed it up and added my homemade hazelnut butter and it was SO good! - Butter adds moisture and a little richness that keeps the texture from going rubbery in the microwave, which is honestly the number one mug cake problem.
- Brown sugar adds just enough sweetness with a slight molasses depth that pairs really well with peanut butter. It’s not overly sweet, which is exactly how I prefer it 🙂
- Baking powder gives the cake a little lift so it doesn’t come out like a dense hockey puck. A small amount goes a long way!
- Cinnamon adds warmth and makes the whole thing smell amazing when it comes out of the microwave. It’s subtle but it makes a difference to me personally.
- Vanilla extract rounds everything out nicely.
- Milk brings the batter together and keeps everything moist and smooth. Use whatever you have, dairy-free works great too!
- The pinch of salt balances the sweetness, and the optional chocolate chips? They melt right into the cake!
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Peanut Butter Mug Cake Recipe
Makes: 1 mug cake
Ingredients
- ¼ cup all-purpose flour
- 3 tbsp peanut butter
- 1 tbsp butter, melted
- 1 tbsp brown sugar
- ¼ tsp baking powder
- ¼ tsp cinnamon
- ½ tsp vanilla extract
- ¼ cup milk
- A pinch of salt
- Dark chocolate chips (optional)
Instructions
In a microwave safe mug (12-14 oz), add the butter, peanut butter, brown sugar, milk and vanilla and whisk vigorously until blended.
Add the remaining ingredients and mix until smooth and no flour chunks remain.
Add chocolate chips if using.
Microwave on high for 60-70 seconds until the top looks set. Enjoy warm!
Estimated Nutrition
This is a rough estimate, but it gives you a good idea.
Per 1 mug cake (without chocolate chips):
Calories ~380
Protein ~13g
Fat ~22g
Carbs ~35g
Sugar ~12g
Add roughly 50-70 calories and 4-5g more fat if you toss in a generous handful of chocolate chips.
How to Enjoy Mug Cakes
This is a one-serving recipe, so it’s perfectly sized for one mom who deserves a little something just for herself 🙂
Eat it straight from the mug while it’s warm, because that’s when the texture is at its best. If you added chocolate chips, give it about 30 seconds after the microwave so they settle and you don’t burn your tongue (ask me how I know, haha :P).
This one doesn’t store well, honestly. Mug cakes are best fresh, so just make it when you want it.
The whole thing takes maybe three minutes start to finish, so there’s really no need to prep it in advance.
If you want to mix it up, try adding a spoonful of Nutella on top, a drizzle of honey, or swapping the peanut butter for almond butter if that’s what you have on hand!
If peanut butter and chocolate is your favorite combo, my no-bake peanut butter chocolate protein balls are a great grab-and-go option too.
Peanut Butter Mug Cake
A quick, single-serving peanut butter mug cake made in the microwave in about two minutes. It's soft, warm, and just sweet enough to feel like a real treat without dirtying every dish in the kitchen.
Ingredients
- ¼ cup all-purpose flour
- 3 tbsp peanut butter
- 1 tbsp butter, melted
- 1 tbsp brown sugar
- ¼ tsp baking powder
- ¼ tsp cinnamon
- ½ tsp vanilla extract
- ¼ cup milk
- A pinch of salt
- Semi-sweet chocolate chips (optional)
Instructions
- In a microwave safe mug (12–14 oz), add the butter, peanut butter, brown sugar, milk and vanilla and whisk vigorously until blended.
- Add the remaining ingredients and mix until smooth and no flour chunks remain. Add chocolate chips if using.
- Microwave on high for 60-70 seconds until the top looks set. Enjoy warm!
Notes
- Mug cakes are best eaten fresh and straight from the mug while warm. If you added chocolate chips, give it about 30 seconds after the microwave so they settle.
- Try adding a spoonful of Nutella on top, a drizzle of honey, or swapping the peanut butter for almond butter if that's what you have on hand.
Final Thoughts
This peanut butter mug cake has become my quiet-moment treat.
The kind of thing I make when the house is calm for five minutes and I want to actually enjoy it. I found it great as a postpartum snack or breakfast when I just wasn’t feeling anything else.
Let me know if you try this peanut butter mug cake!
