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Keto Lemon Blueberry Mug Cake

A bright, single-serve mug cake ready in under 5 minutes. Mixed and cooked right in the mug. Yields 3 individual mugs.

  • Total Time6 minutes
  • Yield3 1x

Ingredients

Scale
  • 3 tablespoons unsalted butter (divided)
  • 1/4 cup erythritol–monk fruit granular blend (divided)
  • 3 tablespoons superfine almond flour (divided)
  • 2 1/2 tablespoons coconut flour (divided)
  • 3/4 teaspoon baking powder (divided)
  • 1/8 teaspoon fine sea salt
  • Pinch ground cardamom (optional)
  • 3 large eggs (at room temperature)
  • 2/3 cup fresh or frozen blueberries (divided)
  • 3 tablespoons fresh lemon juice (divided)
  • 1 teaspoon vanilla bean paste
  • Zest of 1 small lemon (about 1 teaspoon, divided)

Instructions

  1. For each mug: melt 1 tablespoon butter in a wide, microwave-safe mug, swirl to coat, add a portion of lemon zest and rest 1 minute.
  2. Whisk in 1 egg, 1 tablespoon lemon juice, and 1/3 teaspoon vanilla bean paste until slightly frothy.
  3. Add 1 tablespoon almond flour, 2 1/2 teaspoons coconut flour, 1 tablespoon sweetener, 1/4 teaspoon baking powder, a pinch of salt, and optional cardamom. Stir just to combine.
  4. Fold in about 2 1/2 tablespoons blueberries.
  5. Microwave on high 70–90 seconds until the top is set, springs back, and a toothpick comes out mostly clean.
  6. Top immediately with about 1 tablespoon remaining blueberries, 1 teaspoon sweetener, and a tiny splash of lemon juice or water. Lightly mash to make a quick compote. Rest 1 minute before eating.

Notes

  • Storage: Best enjoyed immediately. Cover and refrigerate up to 24 hours if needed.
  • Swaps: Raspberries or chopped strawberries may replace blueberries. Lime may replace lemon. Use 1/2 teaspoon vanilla extract if needed.
  • Troubleshooting: If spongy or rubbery, reduce microwave time in 15-second steps.
  • Dietary: Not suitable for strict ketogenic diets; low-carb.

Nutrition Facts (1 of 3 mugs): Calories: 265 kcal | Total Fat: 20.8 g (Saturated Fat: 10.0 g) | Total Carbs: 28.1 g (Fiber: 3.7 g, Net Carbs: 7.8 g) | Protein: 9.0 g | Sodium: 276 mg

These values are approximate and may vary based on ingredients and preparation.

  • Prep Time: 4 minutes
  • Cook Time: 2 minutes
  • Category: Dessert
  • Cuisine: American

Nutrition

  • Calories: 265

Find it online: https://dietareas.com/2025/07/19/one-bowl-5-minutes-your-new-favorite-keto-mug-cake/