1-Minute Low-Carb Mug Cake with Lemon Curd

Lemon Curd Low-Carb Mug Cake in a light blue dish with whipped cream on the side. There is a curled piece of lemon peel on top.
Cooked lemon curd low-carb mug cake in a black mug.
Above view of a lemon curd low-carb mug cake in a dish with whipped cream on the side.
Lemon Curd Low-Carb Mug Cake in a dish with whipped cream on the side.
A variety of pictures of lemon curd low-card mug cakes. There are picture of cooked cakes and uncooked batter in a mug.
Butter and cream cheese melted together in a black mug.
Batter of lemon curd low-carb mug can in a black mug. The lemon curd filling has been been covered by the batter.
The ingredients for lemon curd low-carb mug cake are in a black mug. The ingredients have not been mixed yet.
The back of a fork is pushing the lemon curd filling into the cake batter in a black mug.
low-carb lemon curd cake served in a dish with whipped cream and lemon curd
Lemon Curb Low-Carb Mug Cake in a light blue dish with whipped cream on the side and lemon zest on top.
A variety of pictures of lemon curd low-card mug cakes. There are picture of cooked cakes and uncooked batter in a mug.

If you are looking for a dessert that is sweet and tangy, this low-carb mug cake with keto lemon curd is exactly what you are looking for! Not only is this mug cake low-carb it is also sugar-free and gluten-free!

The best part? This mug cake comes in at only 5.9g net carbs!

FREE low-carb and keto 5-day meal plan mockup on yellow background
low-carb lemon curd cake served in a dish with whipped cream and lemon curd

1-Minute Lemon Curd Low-Carb Mug Cake

Sweet and tangy, this keto lemon curd mug cake will blow you away. This is not your typical mug cake, but it still just as easy to make as the rest of them.

The batter of this mug cake mixes with a homemade lemon curd/custard to give your cake a tangy sponge cake texture you are going to love!

low-carb lemon curd cake served in a dish with whipped cream and lemon curd

Making Keto Lemon Curd

To make this mug cake you are going to need to have a batch of my lemon meringue filling ready to go. The lemon custard/curd (whichever you call it) takes less than 10 minutes to make and will last in the refrigerator for up to a week, so it is perfect for making in advance.

If you know you won’t use all the lemon curd in a week, you can also freeze it so that it lasts longer. I like to flash freeze the curd in spoonfuls on a lined baking sheet until they are hard, then store the frozen spoonfuls in a zip freezer bag or airtight container.

Freezing the lemon curd in spoonfuls allows you to you easily grab small portion sizes of the keto lemon curd whenever you need it.

Making Lemon Curd Low-Carb Mug Cake Batter

FREE low-carb and keto 5-day meal plan mockup on yellow background

Making the batter for this mug cake is much like my keto vanilla berry mug cake. Instead of pushing frozen berries into the batter, you will push lemon custard under the batter.

To make the batter, add your butter and cream cheese to your mug and melt it in the microwave for 20 seconds. Next, mix in the remaining batter ingredients except for the lemon curd. That will be added last.

Be sure to scrape the sides and bottom of the mug while you are mixing the batter. When the batter is all mixed, drop a couple of spoonfuls of the lemon curd into the center of the batter. Then use the back of a fork to carefully press the lemon curd down until it is covered with batter.

Cooking Lemon Curd Low-Carb Mug Cake

Tap the mug on the counter to remove any air bubble. Then, cook the mug cake on high in the microwave for 1 minute. If the mug cake isn’t done after 1 minute, let it cook for an additional 20 seconds. My cake only took 1 minute to cook.

You won’t be able to use a toothpick to check for doneness on this recipe since the center is gooey lemon curd. Instead, you’ll need to eyeball the cake for doneness. If the cake parts still look raw, then it probably is and needs a bit longer to cook.

low-carb lemon curd cake served in a dish with whipped cream and lemon curd

No Microwave? No Problem

If you do not have a microwave (or don’t like to use them), you can still make this mug cake. You will instead want to bake your individual cake in the oven using a cupcake pan or oven-safe ramekin.

Bake the cake at 180C/350F in the oven for 12 minutes, or until it is done.

low-carb lemon curd cake served in a dish with whipped cream and lemon curd

1-Minute Lemon Curd Low-Carb Mug Cake

Now that your cake is cooked, you are ready to eat it. The lemon custard will absorb into the cake leaving the center glazed with sweet, sticky lemon coating. This means you get that delicious lemon flavor with every bite.

To really dress up your cake, remove it from the mug and top it with whipped cream. If you like lemon, this mug cake is to die for!

low-carb lemon curd cake served in a dish with whipped cream and lemon curd

More Low-Carb Dessert Recipes You May Like:

LOW-CARB SWEET TREATS: Want to enjoy parties AND stay on track? Get healthy low-carb recipes you’ll LOVE – DON’T WAIT – BUY NOW

21 Low-Carb Sweet Treats - perfect for winter parties. 21 easy gluten-free and low-carb recipes, 10 baked desserts, 8 sweet treats, 3 beverages. #lowcarbdesserts #ketodesserts #sugarfreedesserts #healthydesserts #glutenfreedesserts

Lemon Curd Low-Carb Mug Cake in a dish with whipped cream on the side.

1-Minute Lemon Curd Low-Carb Mug Cake

How to make a quick and tasty lemon curd mug cake in the microwave

.wprm-recipe-rating .wprm-rating-star.wprm-rating-star-full svg * { fill: #ffffff; }

4.67 from 3 votes

Print Pin Share Comment
Share by Email

Cuisine: Gluten Free, Grain free, Keto, LCHF, Low Carb, No Sugars, Wheat Free

Diet: Diabetic, Gluten Free, Vegetarian

Prep Time: 3 minutes

Cook Time: 1 minute

Total Time: 4 minutes

Servings: 1

NET carbs: 5.9g

Author: Libby Jenkinson

Recipe Video (tap to play)

Calculate ingredients

Adjustable servings >> 1

Ingredients

Instructions

  • Place the butter and cream cheese in your chosen microwavable mug. Microwave on HIGH for 20 seconds.

  • Add the remaining ingredients apart from the lemon curd/custard to the mug and mix well.

  • Drop the lemon curd/custard into the batter. Use the back of a fork or knife to push the curd into the middle of the batter until it is covered.

  • Microwave on HIGH for 1:20 seconds minute. Enjoy!

Notes

Please adjust the microwave cooking times according to the strength of your microwave.
My microwave is pretty powerful and only requires 1 minute, but most standard microwaves may require the 1:20 as stated in the recipe.
No microwave? No problem. Simply bake at 180C/350F in a cupcake case or muffin tray for 12 minutes. 

Nutrition

Nutrition Facts

1-Minute Lemon Curd Low-Carb Mug Cake

Amount Per Serving (1 mug cake)

Calories 357.4 Calories from Fat 293

% Daily Value*

Fat 32.6g50%

Sodium 288.1mg13%

Potassium 227mg6%

Total Carbohydrates 11.5g4%

Fiber 5.6g23%

Sugar 3.7g4%

Protein 14.4g29%

Vitamin A 981.9IU20%

Vitamin B1 0.1mg7%

Vitamin B6 0.1mg5%

Vitamin B12 0.5µg8%

Vitamin C 2.6mg3%

Vitamin D 1.3µg9%

Vitamin E 0.8mg5%

Calcium 107.2mg11%

Folate 20.7µg5%

Iron 1.1mg6%

Magnesium 5.3mg1%

Selenium 13.5µg19%

Zinc 0.6mg4%

NET carbs 5.9g

* Percent Daily Values are based on a 2000 calorie diet.

Want to start FAST?DOWNLOAD – your FREE 5-day meal plan & shopping list and start today
4-WEEK QUICKSTARTSTART NOW – it’s FINALLY time to reach your goal AND stay there
CookbooksSHOP NOW – make life easy. All the resources you’ll ever need