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Bright, zesty, and ready in just minutes, this Keto Lemon Almond Flour Mug Cake is the perfect low-carb treat when you’re craving something sweet but still want to stay on track. Made with wholesome keto-friendly ingredients and no added sugar, this single-serve dessert is light, fluffy, and bursting with fresh lemon flavor.

A yellow mug with lemon mug cake and lemon slices, placed on a green checkered cloth next to two forks on a countertop.

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Why You’ll Love This Recipe

Quick & Easy: From prep to microwave, it takes less than 5 minutes!
Low-Carb & Sugar-Free: Sweetened with allulose and made with almond flour to keep carbs low.
Fresh & Flavorful: The lemon juice and zest give it a tangy kick that’s refreshing and satisfying.
Versatile: Enjoy it on its own, or top it with a dollop of whipped cream or keto-friendly glaze for extra indulgence.

Ingredients

Gather your low carb ingredients to make this tasty lemon mug cake!

Almond Flour: The perfect keto-friendly flour for mug cakes. It gives a moist, cake-like texture without the carbs.
Allulose: A natural, zero-calorie sweetener that tastes just like sugar without the glycemic spike. Other low carb sweeteners can be substituted.
Baking Powder: Helps the mug cake rise and become light and airy.
Egg: Binds everything together and provides structure.
Coconut Oil or Melted Butter: Adds moisture and richness. Choose your favorite based on flavor preference.
Lemon Juice & Zest: The stars of the show! These bring in bright, citrusy flavor and aroma.
Vanilla Extract: Balances the tartness of the lemon and enhances the overall flavor.

How To Make Keto Lemon Mug Cake

A mug containing a mixture of dry ingredients, including flour and baking powder, sits on a speckled countertop.

Mix dry ingredients in a mug.

A white mug with a green handle contains raw eggs, vanilla extract, and other baking ingredients on a beige countertop.

Add wet ingredients, mix and microwave.

Recipe tips

Use a microwave-safe mug that’s at least 8 oz to prevent overflowing.

If you prefer a lighter texture, beat the egg separately before adding it to the batter.

For extra lemon flavor, you can add a few drops of lemon extract.

Let the cake cool for a minute before eating—this helps the flavors settle and avoids burning your mouth!

A piece of lemon mug cake on a fork above a plate, with lemon slices and a partially eaten mug cake; a green mug and checkered cloth are in the background.

Serving Suggestions

Top with a dusting of powdered allulose or a drizzle of lemon glaze.

Serve with a spoonful of whipped cream or a scoop of keto vanilla ice cream.

Garnish with a few fresh berries for a pop of color and natural sweetness.

More Keto mug Cake Recipes

Keep on track and enjoy a sweet treat with these keto mug cake recipes:

Keto Strawberry Shortcake Mug Cake

Coconut Flour Chocolate Mug Cake

Almond Flour Pumpkin Mug Cake