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Craving something sweet but don’t want to stray from your keto goals? This Keto Lemon Blueberry Mug Cake is the perfect low-carb treat that comes together in just a few minutes! With the bright, zesty flavor of lemon and the juicy sweetness of blueberries, this mug cake is a delicious single-serve dessert that satisfies without the guilt. Plus, it’s made with simple ingredients like almond flour and keto-friendly sweetener, making it an excellent choice for a quick, gluten-free treat.

A keto lemon blueberry mug cake, adorned with three blueberries, rests in a floral cup beside a matching spoon. Fresh blueberries and a sliced lime add vibrant accents to the marble backdrop.

This keto-friendly lemon blueberry mug cake is an easy and satisfying way to curb your dessert cravings without breaking your low-carb lifestyle. Enjoy!

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Why You’ll Love This Keto Lemon Blueberry Mug Cake

Quick & Easy – Ready in just a few minutes, this mug cake is perfect for when you need a fast, satisfying treat.
Keto & Low-Carb – Made with almond flour and keto-friendly sweetener, this dessert keeps your carbs in check without sacrificing flavor.
Bright & Refreshing – The combination of zesty lemon and juicy blueberries creates a light, refreshing flavor that’s perfect for any time of the year.
Single-Serve Convenience – No need to bake an entire cake—this portion-controlled treat satisfies your sweet tooth without leftovers.
Gluten-Free & Grain-Free – A great option for those with dietary restrictions, using only wholesome, keto-friendly ingredients.
Customizable – Want it extra lemony? Add more zest! Prefer a fluffier texture? Try adding a teaspoon of heavy cream!

Ingredients

Each ingredient works together to create a moist, fluffy, and flavorful mug cake that’s perfectly balanced in taste and texture.

Butter – Adds richness and moisture, giving the mug cake a soft, tender texture. Plus, it’s a great source of healthy fats for keto!
Keto-Friendly Sweetener – Choose monk fruit or allulose to keep this cake sugar-free while still satisfying your sweet tooth.
Almond Flour – A low-carb, gluten-free alternative to wheat flour that provides structure and a slightly nutty flavor while keeping the cake fluffy.
Baking Powder – Helps the mug cake rise and become light and airy. Make sure it’s fresh for the best results!
Egg – Acts as a binding agent while also adding protein and helping the cake rise.
Lemon Zest – Packs a punch of fresh citrus flavor that brightens up the cake. Be sure to use an organic lemon for the best zest.
Lemon Juice – Enhances the tangy lemon flavor and adds a slight acidity, which works with the baking powder for better rise.
Blueberries – These little bursts of natural sweetness and antioxidants add a pop of juicy flavor, complementing the lemon beautifully.

How To Make Keto Lemon Blueberry Mug Cake

A raw egg yolk and white sit in a pink-rimmed mug on a dark countertop, ready to transform into a delightful keto lemon blueberry mug cake.

Melt butter in mug.

A mug with creamy cheesecake batter and a touch of lime zest sits on a dark granite countertop, mirroring the vibrant flavors of a keto lemon blueberry mug cake.

Add remaining ingredients and mix.

A mug with a purple handle holds a frothy, light-colored liquid and six floating blueberries, resembling the airy texture of a keto lemon blueberry mug cake, all set on a dark countertop.

Stir in the blueberries and cook.

Recipe Tips

Don’t overmix the batter—stir until just combined to keep the texture light and fluffy.
Check your microwave power—if your microwave is high-wattage, start with 60 seconds and add time in 10-second intervals if needed.
For extra moisture, add a teaspoon of heavy cream or unsweetened almond milk to the batter.
Want a stronger lemon flavor? Add a few drops of lemon extract for an extra citrusy punch.
Fresh or frozen blueberries? Either works! If using frozen, don’t thaw them first to avoid excess moisture in the batter.

More Keto Mug Cakes

Enjoy cake on a keto diet with these other keto mug cakes.

Almond Flour Chocolate Mug Cake

Coconut Flour Pumpkin Mug Cake