Last Updated on August 20, 2026 by Rita
Mug cake peanut eggs is a quick flourless peanut butter mug cake made with peanut butter, one egg, sweetener, and baking soda, and it cooks in about 30 seconds. This single-serving microwave cake has puffed edges and a soft, gooey center. I love how a few simple ingredients can turn into a warm dessert so quickly; it reminds me of the uncomplicated treats I learned to appreciate while baking with my grandmother. For me, mug cake peanut eggs brings that same homemade comfort into one mug, while natural creamy peanut butter gives every spoonful a rich, nutty flavor.
For another simple treat, try my lemon cottage cheese mug cake.
Table of Contents
Table of Contents
What Is Mug Cake Peanut Eggs?
Mug cake peanut eggs is a flourless, single-serving microwave cake that uses natural creamy peanut butter and one large egg as its base. Unlike a traditional mug cake, this recipe needs no flour. Instead, the egg provides structure, while 1/4 cup peanut butter creates a rich, moist texture and deep nutty flavor. Sweetener balances the peanut butter, and 1/4 teaspoon baking soda helps complete the batter. Moreover, it cooks in about 30 seconds, although you can add another 10 seconds when needed. The ideal result has puffed, cooked edges with a deliciously gooey center.
Key Ingredients for Making Mug Cake Peanut Eggs
The ingredients for mug cake peanut eggs keep this flourless recipe simple. Start with 1/4 cup natural creamy peanut butter, ideally made with ground peanuts and salt. Next, add 1 large egg for structure. For sweetness, use your preferred granulated sweetener in an amount equal to 2 tablespoons of sugar; the reference recipe uses 1/2 teaspoon stevia glycerite. Finally, add 1/4 teaspoon baking soda, or substitute 1/2 teaspoon baking powder. If your peanut butter contains only peanuts and no salt, you can also add a pinch of salt. These four core ingredients create the rich peanut butter batter.
For another easy dessert, try my matcha latte mug cake.
How to Make Mug Cake Peanut Eggs in 5 Steps
Making mug cake peanut eggs takes only a few minutes, and thorough mixing helps create the smoothest texture.
Step 1: Mix the Peanut Butter and Egg
Add 1/4 cup natural creamy peanut butter and 1 large egg to a medium mug or large ramekin. Mix thoroughly until completely smooth, and check the bottom for any unmixed peanut butter.
Step 2: Adjust the Batter if Needed
If the batter feels very thick and sticky, add 1 tablespoon water. Then, continue mixing until smooth.
Step 3: Add Sweetener and Baking Soda
Mix in granulated sweetener equal to 2 tablespoons sugar, followed by 1/4 teaspoon baking soda. Alternatively, use 1/2 teaspoon baking powder.
Step 4: Microwave
Place the mug on a microwave-safe plate. Microwave for 30 seconds. If the center looks very wet, cook for another 10 seconds. Aim for puffed edges and a gooey center.
Step 5: Serve
Enjoy the cake immediately, or add a dollop of whipped cream for a richer finish.
Essential Tools for Making This Recipe
You only need a few basic tools to make mug cake peanut eggs. First, choose a medium microwave-safe mug or large ramekin; the reference recipe works with mugs from 10 to 15 ounces as well as a 4-inch ramekin. Next, grab a fork to thoroughly combine the peanut butter and egg until no peanut butter remains on the bottom. You’ll also need measuring cups and spoons for accurate portions. Additionally, place the mug on a microwave-safe plate to catch possible spills. Finally, use your microwave for the quick 30-second cook, adding another 10 seconds only when necessary.
The Health Benefits of Mug Cake Peanut Eggs
Mug cake peanut eggs combines peanut butter and egg in one filling single-serving cake. According to the supplied recipe, one serving provides about 22 grams of protein and 6 grams of fiber, which makes it more protein-rich than many traditional sweet treats. Additionally, the recipe contains no flour, and the reference classifies it as gluten-free when you choose suitable ingredients. Peanut butter also gives the cake its satisfying richness, while the egg contributes additional protein. However, one serving contains about 472 calories and 35 grams of fat, so I like to enjoy this rich mug cake according to my individual needs and appetite.
For another protein-focused microwave treat, try my sourdough discard chocolate chip muffins.
Expert Tips for the Best Texture
For the best mug cake peanut eggs, start with a freshly opened jar of natural creamy peanut butter and stir it thoroughly, since drier peanut butter can make the batter too thick. Next, mix the peanut butter and egg until the mixture looks completely smooth and uniform. If it stays thick or sticky, add 1 tablespoon of water. Microwave power also matters. For a 1000-watt microwave, start at 30 seconds and add 10 seconds if needed. For a 1200-watt microwave, start at 20 seconds. Most importantly, aim for puffed edges and a gooey center rather than cooking the cake until completely firm.
For another soft peanut butter treat, try my Flourless Peanut Butter Mug Cake.
Variations of Mug Cake Peanut Eggs
You can customize mug cake peanut eggs while keeping its simple peanut butter base. For a sweeter dessert, top the finished cake with whipped cream or chocolate whipped cream. Additionally, chocolate chips can add a more indulgent finish. If you want a lighter variation, the reference recipe uses 4 tablespoons PB2, 4 tablespoons liquid egg whites, sweetener equal to 1 tablespoon sugar, 1/4 teaspoon baking powder, and 1/2 tablespoon dark chocolate chips. However, that variation creates a different batter and requires its own measurements. You can also replace baking soda with 1/2 teaspoon baking powder in the original recipe.
For another easy variation, try my Chocolate Peanut Butter Mug Cake.
Storage and Reheating Tips for Mug Cake Peanut Eggs
Although mug cake peanut eggs tastes especially good fresh and warm, you can prepare or store it ahead. For an easy morning option, mix the batter the night before, cover the mug with plastic wrap, and refrigerate it. Then, remove the wrap and microwave the cake when you’re ready. For leftovers, let the cake cool, cover the mug, and refrigerate it for up to 4 days as long as you haven’t added whipped cream. Alternatively, cool it completely, wrap the mug with plastic wrap and foil, and freeze it for up to 3 months. Remove all wrapping before defrosting it in the microwave.
Common Mistakes to Avoid When Making Mug Cake Peanut Eggs
A few mistakes can change the texture of mug cake peanut eggs. First, don’t use dry, poorly stirred natural peanut butter because it can create an overly thick batter. Instead, stir the peanut butter well before measuring it. Next, thoroughly mix the peanut butter and egg, including any mixture stuck at the bottom of the mug. If the batter remains thick and sticky, add 1 tablespoon water. Also, don’t automatically microwave the cake until firm. Start with 30 seconds in a 1000-watt microwave and add 10 seconds only if needed. Finally, aim for puffed edges and a gooey center to avoid a dry result.
Frequently Asked Questions About Mug Cake Peanut Eggs
How do I make a 3-ingredient mug cake with peanut butter?
The supplied mug cake peanut eggs recipe uses four core ingredients: peanut butter, egg, sweetener, and baking soda. Therefore, removing one would create a different recipe. For this tested version, mix 1/4 cup peanut butter with 1 large egg, then add sweetener and baking soda before microwaving.
Can I put an egg in a mug cake?
Yes. This recipe uses 1 large egg. Mix it thoroughly with the peanut butter until the batter looks completely smooth and no peanut butter remains at the bottom of the mug.
How to make a 3 ingredient mug cake?
This specific recipe does not use only three ingredients. It requires peanut butter, egg, sweetener, and baking soda. You can substitute 1/2 teaspoon baking powder for the 1/4 teaspoon baking soda, but the recipe still contains four core ingredients.
How to make a 2 ingredient mug cake?
The supplied recipe does not support a two-ingredient version. Although peanut butter and egg form its main base, the tested recipe also uses sweetener and baking soda. Omitting those ingredients would change the recipe, so I recommend following the supplied four-ingredient formula for the intended result.
Why You’ll Love This Mug Cake Peanut Eggs
I love mug cake peanut eggs because it turns four simple ingredients into a rich, flourless treat in minutes. Natural creamy peanut butter creates deep nutty flavor, while the egg gives the cake structure and helps create those satisfying puffed edges. Better yet, the microwave cooks it in about 30 seconds, so I don’t need an oven or a pile of dishes. The center can stay deliciously gooey while the edges set, which gives every bite a soft, moist texture. Plus, the supplied recipe provides 22 grams of protein per serving, making this an especially satisfying option when a peanut butter craving hits.
Print
Mug Cake Peanut Eggs: Easy 4-Ingredient Gooey Treat
Mug Cake Peanut Eggs is a soft, flourless peanut butter mug cake made with natural creamy peanut butter, one egg, sweetener, and baking soda. It cooks in about 30 seconds and delivers puffed edges with a moist, gooey peanut butter center.
- Total Time: 6 minutes
- Yield: 1 serving 1x
Ingredients
Instructions
1. In a medium mug or large ramekin, mix the peanut butter and egg until completely incorporated. Check the bottom to make sure no peanut butter residue remains.
2. If the batter seems very thick, sticky, and difficult to mix, add 1 tablespoon of water and continue mixing until completely smooth.
3. Mix in the sweetener, then add the baking soda and mix well.
4. Place the mug on a microwave-safe plate to catch any spills. Microwave for 30 seconds. Check the cake, and if it looks very wet, microwave for another 10 seconds. The edges should look puffed and cooked while the center remains gooey.
5. Enjoy the mug cake as is, or top it with a dollop of whipped cream if desired.
Notes
Use a freshly opened jar of natural peanut butter and stir it well. Peanut butter from a half-used jar may become too dry.
If your natural peanut butter contains only peanuts and no salt, add a pinch of salt.
Mix the peanut butter and egg thoroughly until the batter looks completely smooth and uniform.
If the batter becomes very thick and sticky, add 1 tablespoon of water to make mixing easier.
Microwave power varies. For a standard 1000-watt microwave, start with 30 seconds, check the cake, and add 10 seconds if needed.
For a powerful 1200-watt microwave, start with 20 seconds and add additional time as needed.
Aim for puffed, cooked edges and a gooey center rather than a completely firm cake.
A 10-ounce mug, 15-ounce mug, or 4-inch-wide ramekin can work for this recipe.
You can prepare the batter the night before, cover the mug with plastic wrap, and refrigerate it. Remove the plastic wrap before microwaving.
Store cooled leftovers without whipped cream in the refrigerator for up to 4 days.
For freezing, cool the cake completely, wrap the mug with plastic wrap followed by foil, and freeze for up to 3 months. Remove all wrapping before defrosting in the microwave.
Sweetness is a personal preference, so adjust the sweetener to taste.
- Prep Time: 5 minutes
- Cook Time: 1 minute
- Category: Healthy Mug Cakes
- Method: Microwave
- Cuisine: American
- Diet: Gluten Free
Nutrition
- Serving Size: 1 cake
- Calories: 472
- Sugar: 4 g
- Sodium: 465 mg
- Fat: 35 g
- Saturated Fat: 5 g
- Carbohydrates: 14 g
- Fiber: 6 g
- Protein: 22 g
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