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Keto Lemon Mug Cake - Bright, Zesty, and Ready in Minutes

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Prep Time 5 minutes
Cook Time 2 minutes
Total Time 7 minutes
Servings: 1 servings
Ingredients Method

Ingredients
  

  • Almond flour (2 tablespoons, fine blanched) – For tender crumb and low carbs.
  • Coconut flour (1/2 tablespoon) – Adds structure and absorbs moisture.
  • Baking powder (1/4 teaspoon) – For lift.
  • Granulated keto sweetener (1.5–2 tablespoons) – Erythritol, allulose, or a blend.
  • Egg (1 large) – Binds and adds moisture.
  • Unsalted butter (1 tablespoon, melted) – For richness. Coconut oil works too.
  • Heavy cream (1 tablespoon) – Keeps it soft. Unsweetened almond milk works in a pinch.
  • Fresh lemon zest (about 1 teaspoon, from 1/2 lemon) – Big flavor boost.
  • Fresh lemon juice (1–1.5 teaspoons) – Bright acidity.
  • Vanilla extract (1/4 teaspoon) – Rounds out the flavor.
  • Pinch of salt – Balances sweetness and enhances lemon.
  • Optional toppings – A quick lemon glaze (powdered keto sweetener + lemon juice), whipped cream, or a few blueberries.

Method
 

  1. Choose the right mug. Pick a microwave-safe mug that holds at least 10–12 ounces. A wider mug helps the cake cook more evenly.
  2. Combine dry ingredients. In the mug, whisk together almond flour, coconut flour, baking powder, sweetener, and a small pinch of salt. Break up any lumps so the batter stays smooth.
  3. Add wet ingredients. Add the egg, melted butter, heavy cream, lemon juice, lemon zest, and vanilla. Stir with a fork or small whisk until fully combined. The batter should be thick but scoopable.
  4. Taste and adjust. If you prefer it sweeter, add a touch more sweetener. For stronger lemon flavor, add a pinch more zest.
  5. Microwave in intervals. Microwave on high for 45 seconds. Check the center—if it’s still glossy, continue in 10–15 second bursts until set. Total time is usually 55–75 seconds depending on your microwave.
  6. Rest briefly. Let the cake sit for 1–2 minutes. It finishes setting and stays moist.
  7. Top and serve. Enjoy as is, or whisk a quick glaze: 2 teaspoons powdered keto sweetener with about 1/2–1 teaspoon lemon juice until pourable. Drizzle on top and serve warm.