Easy Keto Microwave Lemon Mug Cake

Let me tell you something about mug cakes. Most of them are dry, spongy, or taste like a science experiment. This Keto Microwave Lemon Mug Cake is the opposite – moist, tangy, and so good you won’t believe it’s low carb.

We’re talking a buttery, lemony cake made with coconut flour, ground almonds, and xylitol. Topped with creamy Greek yogurt.

The microwave does the work in just 2 minutes. The lemon zest and juice give it that bright, fresh flavor. The coconut flour and almonds keep it low carb and keto friendly. And the Greek yogurt adds a tangy, creamy finish.

Seven minutes. One mug. And you’ve got a single-serve dessert that’s perfect for when you need something sweet but don’t want to bake a whole cake.

Let’s make some mug cake.

Try my Blackberry and Apple Cake recipe.

Why You’ll Love the Recipe

• 7 minutes start to finish. Faster than going to a bakery.
• Low carb + keto friendly. Coconut flour and xylitol.
• Single serve. No leftovers tempting you.
• Bright lemon flavor. Fresh and zesty.
• Moist and buttery. Not dry like most mug cakes.
• Gluten free + grain free. Fits almost every diet.
• Sugar free. Xylitol sweetens without the carbs.
• Microwave only. No oven required.

Try my Fluffy Pancakes with Apple Compote recipe.

What You’ll Need to Make

You’ll need a small bowl, a whisk or fork, a 1-cup (240ml) heatproof mug, a microwave, and a spoon for serving.

Ingredients (Serves 1):

• 2 tbsp. butter, melted and cooled
• 1 large egg
• 1 tsp. grated lemon rind (zest)
• ¼ cup (25g) coconut flour
• 1 tbsp. ground almonds
• 2 tsp. xylitol (or other keto sweetener)
• ½ tsp. baking powder
• 2 tbsp. almond milk
• 1 tbsp. lemon juice
• 2 tbsp. Greek yogurt (sugar-free), for serving

Try my Lemon Blueberry Yogurt Cake recipe.

What You’ll Need to Do

Alright, let’s make a lemon mug cake that’s ready in minutes and tastes like you spent all day baking.

First, in a small bowl, whisk together the melted (and cooled) butter, egg, and lemon zest.

Add the coconut flour, ground almonds, xylitol, baking powder, almond milk, and lemon juice. Stir well until everything is combined and smooth.

Transfer the mixture into a 1-cup (240ml) heatproof mug.

Microwave on high for 2 minutes. (Cooking times vary by microwave. Check at 1:30 if yours runs hot.)

Remove from the microwave and let it sit for 30 seconds. This lets the cake finish setting.

Top with a dollop of sugar-free Greek yogurt.

Serve immediately. Eat warm, straight from the mug.

Enjoy with a spoon. Get some cake and some creamy yogurt in every bite.

Easy Ingredient Swaps

• No coconut flour? Use 2 tbsp almond flour + 1 tbsp coconut flour (texture will vary).
• No ground almonds? Use almond flour or omit (add extra coconut flour).
• No xylitol? Use erythritol, monk fruit sweetener, or stevia (adjust to taste).
• No almond milk? Use heavy cream, coconut milk, or regular milk (not dairy free).
• No Greek yogurt? Use sour cream or coconut cream.
• Add vanilla: Add ½ tsp vanilla extract.
• Add poppy seeds: Add 1 tsp poppy seeds for a lemon-poppy twist.

Some Twist and Tweak Ideas

• Lemon poppy seed: Add 1 tsp poppy seeds to the batter.
• Blueberry lemon: Add 2 tbsp fresh or frozen blueberries.
• Lime version: Use lime zest and juice instead of lemon.
• Orange version: Use orange zest and juice instead of lemon.
• Coconut version: Add 1 tbsp shredded coconut.
• Chocolate version: Add 1 tsp cocoa powder (reduce lemon juice to ½ tbsp).
• Nutty version: Add 1 tbsp chopped pecans or walnuts.

Some Helpful Tips

• Let butter cool slightly. Hot butter can cook the egg. Let it cool for 2-3 minutes before mixing.
• Use a 1-cup (240ml) mug. This size gives the cake room to rise without overflowing.
• Microwave times vary. Start with 1:30 and add 10-second increments if needed. Overcooking makes it dry.
• Don’t overmix. Stir just until combined. Overmixing can make the cake tough.
• Let it rest for 30 seconds. The cake continues cooking from residual heat.
• Top with yogurt. The tangy yogurt balances the sweet lemon.

Some Budget-Friendly Tips

• Coconut flour is an investment. A bag costs a few dollars but lasts for many recipes. Store in a cool, dry place.
• Ground almonds can be pricey. Buy whole almonds and grind them yourself in a food processor. Cheaper and fresher.
• Xylitol is the splurge. Buy in bulk online. Use erythritol if it’s cheaper.
• Lemons are cheap. One lemon gives you zest and juice.
• Greek yogurt in bulk. Buy a large tub. Use the rest for breakfast bowls or sauces.
• Make a double batch. Twice the cake. Same amount of work. Share with a friend or save for later.

Some Serving Ideas

• As dessert. Warm with Greek yogurt.
• As a snack. Perfect for an afternoon pick-me-up.
• Post-workout. 15g of protein with yogurt.
• For a crowd. Make individual mugs. Everyone gets their own.
• With berries. Top with fresh raspberries or blueberries.
• With whipped cream. For an extra decadent treat.

Some Storage and Reheating Tips

Fridge: Store in an airtight container for up to 2 days. The texture may change slightly.

Freezer: Not recommended. The texture of coconut flour cakes can become dry when frozen.

Reheating:

• Microwave: 15-20 seconds.
• Do not overheat. It will dry out.

Best enjoyed fresh. Mug cakes are at their best straight out of the microwave.

Final Thoughts

Look, I love a good dessert. But I don’t always want to bake a whole cake or eat a ton of sugar. This Keto Microwave Lemon Mug Cake is my solution.

Moist, lemony, buttery cake made with coconut flour, ground almonds, and xylitol. Topped with creamy Greek yogurt.

Seven minutes. Low carb. Keto friendly. Gluten free. Sugar free.

Make it for dessert. Make it for a snack. Make it when you need something sweet without the carbs.

However you serve it, you’re getting a mug cake that’s anything but boring.

Now go make some mug cake.

~ Danny Davis

P.S. If you try the lemon poppy seed version, let me know. That’s my go-to upgrade. The poppy seeds add such a nice crunch. So good.

If you are a lemon lover or are looking for an easy keto lemon dessert, this recipe is for you!

Easy Keto Microwave Lemon Mug Cake

I made a keto mug cake in 2 minutes and it's incredible. 😤 Lemon, coconut flour, ground almonds, xylitol, and Greek yogurt. Low carb. Gluten free. Quick dessert. 🍋

Author: Danny Davis Cooking Method: Microwave Cuisine: American Courses: Dessert, Snack Recipe Keys: Gluten Free Keto Low Carb

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Pin Recipe

Prep Time 5 mins Cook Time 2 mins Total Time 7 mins Difficulty: Beginner Servings: 1 Calories: 469

What you'll need...

Servings

• 2 tbsp butter, melted, cooled
• 1 egg
• 1 tsp grated lemon rind
• ¹⁄₄ cup coconut flour (25g)
• 1 tbsp ground almonds
• 2 tsp xylitol
• ¹⁄₂ tsp baking powder
• 2 tbsp almond milk
• 1 tbsp lemon juice
• 2 tbsp Greek Yogurt, to serve (sugar free)

What you'll need to do...

1. In a small bowl, whisk together the melted (and cooled) butter, egg, and lemon zest until well combined.
2. Add the coconut flour, ground almonds, xylitol, baking powder, almond milk, and lemon juice. Stir well until the batter is smooth and fully combined.
3. Transfer the mixture into a 1-cup (240ml) heatproof mug.
4. Microwave on high for 2 minutes. (Cooking times may vary by microwave wattage. Check at 1 minute 30 seconds.)
5. Remove from the microwave and let stand for 30 seconds.
6. Top with sugar-free Greek yogurt and serve immediately.

Nutrition Facts

Servings 1

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Amount Per Serving

Calories 380kcal

% Daily Value *

Total Fat 32g50%

Saturated Fat 16g80%

Cholesterol 220mg74%

Sodium 180mg8%

Total Carbohydrate 10g4%

Dietary Fiber 6g24%

Sugars 2g

Protein 12g24%

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* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.

Note

Approximate Glycemic Index (GI): 30–35 (low)

Approximate Glycemic Load (GL) per serving: 2–3 (very low)

Note: This recipe is extremely low in carbohydrates (4g net carbs without yogurt, 6g with yogurt). The main carb sources are coconut flour (very low GI, high in fiber), ground almonds (very low GI), xylitol (very low GI, sugar alcohol), lemon juice (low GI), and almond milk (very low GI). The high protein (12-15g) and fat (32-33g) make this a very low-glycemic meal. Xylitol has a negligible effect on blood sugar. For context, pure glucose has a GI of 100. This is an excellent option for diabetic-friendly, low-carb, and keto diets.

Keywords: keto lemon mug cake, low carb mug cake, microwave mug cake, coconut flour mug cake, single serve keto dessert, gluten free mug cake, sugar free dessert, quick keto dessert, lemon microwave cake, keto single serve