Go Back
+ servings
a mug cake

Keto Blueberry Mug Cake

Katrin Nürnberger from sugarfreelondoner.com
Satisfy your cake cravings with a keto blueberry mug cake! This sugar free microwave cake is ready from scratch in just 5 minutes.
Course Dessert
Cuisine British
Prep Time 3 minutes
Cook Time 1 minute
Total Time 4 minutes
Servings 1
Calories 292kcal



  • Stir together the dry ingredients in a bowl - almond flour, coconut flour, baking powder, sweetener. Take care to break up any lumps.
  • In a second bowl, whisk the egg. Then add the melted and cooled butter plus the vanilla extract and whisk until combined.
  • Now, add the dry ingredients to the wet and stir until a smooth batter forms.
  • Grease a mug or ramekin with butter and fill in the batter. Press the blueberries into the centre, leaving a little gap at the top.
  • Microwave for 80 seconds (adjust depending on the power level of your microwave. See suggested microwave timings in the notes below).


5.9g net carbs per mug cake. Nutrition is calculated per cake. Recipe serves 1, although it is filling and could be shared between 2.
Enjoy straight from the mug or invert onto a plate.
Option to dust with powdered sweetener and a squirt of whipped cream.
My microwave operates at 900W and my cake took 80 seconds to cook. Here's a quick overview of recommended baking times for other power levels:
  • 600W = low power. 100 seconds. 
  • 800W = 90 seconds.
  • 900W = 80 seconds. 
  • 1000W = 70 seconds
  • 1200W = 60 seconds. 


Calories: 292kcal | Total Carbohydrates: 9.1g | Protein: 9.8g | Fat: 23.3g | Saturated Fat: 10.2g | Fiber: 3.3g | Sugar: 4g