This Lemon Mug Cake is super easy and full of fresh, citrusy flavor. Itโ€™s a quick mug cake recipe you can make in the microwave, perfect when you want a cozy single-serve dessert fast! Soft, sweet, and lemony, this microwave lemon cake totally hits the spot. If you’re into quick treats, don’t miss my collection of 15-Minute Easy Desserts for plenty of sweet inspiration when you are short on time. If you love mug cakes, be sure to try my Brownie in a Mug next!

Lemon Mug Cakes on a white table with fresh lemons.
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Ingredients & Substitutions

  • Butter: Melting the butter (I prefer unsalted butter) helps everything mix together easily and gives the cake a soft, moist texture. Salted butter works, too, but you may want to leave out the salt in the recipe.
  • Egg: You will only use the yolk of one large egg, making the cake rich and tender without adding too much moisture. Using the entire egg would make this small mug cake rubbery. But, don’t throw out the egg white; save it for another recipe like almond paste or fried ice cream.
  • Lemon Juice: If possible, use freshly squeezed lemon juice. It brightens up both the cake and the glaze with that fresh, tangy zing.
  • Lemon Zest: The lemon zest is optional, but I highly encourage adding it. After all, this is a lemon dessert, so I want the lemon flavor to shine through!
  • Lemon Glaze: The easy lemon glaze is a simple way to add a little extra sweetness and zing. Just mix confectioners’ sugar (powdered sugar) with some lemon juice, and youโ€™ve got a tasty drizzle that makes the mug cake even better. Totally worth it!
Drizzling lemon glaze over Lemon Mug Cakes.

Can I Use Bottled Lemon Juice Instead Of Fresh In Lemon Mug Cake?

Absolutely! You can use bottled lemon juice instead of fresh in your lemon mug cake. Just keep in mind that fresh lemon juice gives a brighter, more vibrant flavor, while bottled juice might be a bit milder or less fresh-tasting. But, bottled juice still works well in a pinch.

Why You’ll Love This Lemon Mug Cake

I am sure you can already figure out why you will love this lemon mug cake! Itโ€™s an easy lemon dessert you can make in just minutes, with fresh, bright lemon flavor and a soft, moist texture. Plus, itโ€™s a single-serve microwave lemon cake, meaning no oven, no mess, and just the right amount to satisfy your sweet tooth fast.

Lemon Mug Cakes on a white table from overhead.

Lemon Mug Cake Troubleshooting: How to Fix Dry, Dense, or Undercooked Microwave Lemon Cakes

  • Dry or rubbery cake: Microwave for less time. Start with 60 seconds, then add 10-second increments as needed. Overcooking causes dryness.
  • Dense or heavy texture: Measure flour carefully and donโ€™t overmix. Use only the egg yolk for a tender cake.
  • Cake wonโ€™t rise: Make sure your baking powder is fresh and donโ€™t skip it; it helps the cake fluff up.
  • Weak lemon flavor: Use freshly squeezed lemon juice and add lemon zest for extra zing. Bottled lemon juice works, but is less vibrant.
  • Glaze too thick or runny: Adjust the amount of lemon juice in the confectioners’ sugar until you get a smooth, pourable glaze.
  • Cake sticks to the mug: Spray the mug well with nonstick spray or grease it lightly before adding batter.
  • Cake overflows in the microwave: Use an 8-ounce (or larger) mug to give the batter room to rise, and avoid filling the mug more than halfway. Microwaves vary, so adjust cooking time if needed to prevent spilling.
Lemon Mug Cake with a bite removed from overhead.

Can I Double This Lemon Mug Cake Recipe?

Yes, you can double this lemon mug cake recipe. Use a larger (12-ounce) mug and increase the microwave time to about 90 seconds, adding 15-second bursts as needed. But if youโ€™re making multiple cakes, itโ€™s best to microwave them one at a time for even cooking and to avoid overflow.

Spoon holding a bite of Lemon Mug Cake directly above the mug.

How To Store Lemon Mug Cake

Lemon mug cake is best enjoyed fresh, but if you have leftovers, let it cool completely and cover the mug tightly with plastic wrap or transfer the cake to an airtight container. Store in the refrigerator for up to 2 days. Reheat it in the microwave for about 10โ€“15 seconds before serving.

Lemon Mug Cakes in white mugs on a white table from overhead.

Lemon Mug Cake

Prep Time 5 minutes
Cook Time 1 minute
Total Time 6 minutes
This Lemon Mug Cake is super easy and full of fresh, citrusy flavor. Itโ€™s a quick mug cake recipe you can make in the microwave, perfect when you want a cozy single-serve dessert fast! Soft, sweet, and lemony, this lemon cake totally hits the spot!

Ingredients

  • 2 tablespoons unsalted butter, melted
  • 2 tablespoons granulated sugar
  • 1 large egg yolk
  • 1 tablespoon freshly squeezed lemon juice
  • ยฝ teaspoon lemon zest, optional, but recommended
  • 2 tablespoons whole milk
  • ยฝ teaspoon pure vanilla extract
  • ยผ cup all-purpose flour
  • ยผ teaspoon baking powder
  • 1 pinch kosher salt

Lemon Glaze

  • 2 tablespoons confectioners’ sugar
  • ยฝ to 1 teaspoon freshly squeezed lemon juice

Instructions

  • Lightly spray an 8-ounce microwave-safe mug with nonstick cooking spray and set aside.
  • In a small mixing bowl, whisk together the melted butter and sugar until smooth.
  • Add the egg yolk, lemon juice, lemon zest (if using), milk, and vanilla. Whisk until fully combined and smooth.
  • Stir in the flour, baking powder, and salt just until no dry streaks remain. Do not overmix.
  • Pour the batter into the prepared mug.
  • Microwave on high for 60 to 90 seconds, or until the top is just set and springs back lightly when touched. Avoid overcooking; the cake will continue to firm up as it cools.
  • While the cake cools slightly, make the glaze. In a small bowl, stir together the confectionersโ€™ sugar and lemon juice until smooth and pourable.
  • Drizzle the glaze over the warm mug cake. Serve immediately.

Did you make this recipe?

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What the Test Kitchen had to say about this recipe:

Autumn

This is super lemony and so soft! I love that it takes only a few minutes to make!

Elizabeth

I am not usually a fan of lemon desserts, but this is great! I love all of our mug cake ideas lately!

Stephanie

I am surprised how good this turned out. If you like lemon desserts, you will love this.

Bella

This is light, moist, and so lemony! I like it, especially with the glaze.

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Meet Amanda Rettke

Amanda Rettke is the creator of I Am Baker, and the bestselling author of Surprise Inside Cakes: Amazing Cakes for Every Occasion โ€“ With a Little Something Extra Inside.Over the course of her 15+ year blogging adventure, she has been featured in and collaborated with the Food Network, New York Times, LA Times, Country Living Magazine, People Magazine, Epicurious, Brides, Romantic Homes, life:beautiful, Publishers Weekly, The Daily Mail, Star Tribune, The Globe and Mail, DailyCandy, YumSugar, The Knot, The Kitchn, and Parade, to name a few.

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