If you love bright lemon flavor, you’ll adore this Keto Lemon Poppy Seed Mug Cake recipe—light, tender, and ready in minutes.
This single-serve keto dessert is a great idea for a quick treat or a simple celebration when someone prefers lemon-flavored sweets. It uses almond flour and a low-carb sweetener, and you can finish it with a lemon glaze or a tangy cream cheese frosting for extra indulgence.
We recommend fresh lemon juice and zest when possible for the cleanest, most natural lemon flavor. If fresh lemons are not available, a good-quality lemon extract or bottled lemon juice can work in a pinch, though the bright, fresh taste will be best with freshly squeezed lemon.
Keto Lemon Poppy Seed Mug Cake Recipe Ingredients
Cake Ingredients
- 1 tbs butter, melted
- 1 egg
- 3 tbs almond flour
- 1/4 tsp baking powder
- 1 tbs monkfruit sweetener (confectioners blend)
- 1 tbs lemon juice (fresh preferred) or 10 drops lemon extract
- 1/2 tsp poppy seeds
- Lemon zest, optional topping
Lemon Glaze Ingredients
- 2 tbs monkfruit sweetener (confectioners blend)
- 1 tbs heavy whipping cream
- 1 tsp lemon juice
- Add more heavy cream 1/2 tsp at a time if the glaze is too thick until you reach desired consistency
- Optional toppings: lemon zest and fresh raspberries
Craving quick and easy mug recipes?
If you enjoy single-serve desserts, mug cakes are perfect: fast, economical, and endlessly adaptable. This lemon poppy seed version is one of many mug-cake favorites that work well for low-carb or keto diets.
Popular mug cake ideas that pair well with this approach include banana nut (keto-friendly versions use almond flour), crème brûlée mug cake, mini pecan pie mug cakes, and savory options such as egg muffins or a meat-lover’s mug cup for breakfast. Explore different flavor combinations by swapping extracts, zest, or add-ins like nuts and berries.
Equipment
- Small bowl
- Spoon or small whisk
- Microwave-safe mug or small microwave-safe container
Instructions
- In a microwave-safe container, melt the butter by microwaving for about 10–15 seconds. Let it sit briefly so it won’t scramble the egg when added.
- Add the egg to the melted butter and whisk or beat briskly until well combined and slightly fluffy.
- Stir in the almond flour, baking powder, monkfruit sweetener, lemon juice (or lemon extract), and poppy seeds. Mix until the batter is smooth and homogenous. Scrape the sides so there are no dry pockets.
- Spray or lightly grease your mug or container with nonstick spray or a touch of butter, then add the batter.
- This recipe makes one large mug cake or two smaller cakes. For one large cake, microwave for about 60 seconds. If you split the batter between two small mugs, microwave each for about 50–60 seconds. Small silicone molds or thin, shallow containers may take only 25–35 seconds—watch closely to avoid overcooking.
- While the cake is cooling slightly, prepare the glaze: whisk the monkfruit confectioners sweetener with heavy cream and lemon juice until smooth. Adjust the texture with small additions of cream if needed.
- Drizzle the glaze over the mug cake, and finish with lemon zest and a few fresh raspberries if desired.
Tips and Variations
- For a richer topping, use a simple keto cream cheese frosting instead of the glaze. A little cream cheese softened and mixed with a touch of sweetener and lemon zest makes a lovely topping.
- Adjust sweetness to taste—monkfruit blends can vary in sweetness level. Taste the glaze before applying and add more sweetener or lemon juice to balance.
- To make this nut-free, experiment with a seed-based flour blend designed for low-carb baking, keeping in mind cooking times and texture will change.
- If you prefer a softer center, reduce microwave time by 5–10 seconds; for a firmer cake, add a few more seconds. Microwaves vary, so use the first batch to dial in the timing for your machine.
Storage
Leftover mug cake can be stored covered in the refrigerator for a day or two. Reheat briefly in the microwave to warm before serving, and add fresh glaze or frosting after reheating.
Notes
Makes one large mug cake or two small mug cakes. Calories: 344 kcal (per large mug cake).
