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.
Servings 3
Calories 277kcal
Equipment
- Three 12- to 16-ounce (350–475 mL) wide-mouthed, microwave-safe mugs
- Small fork or mini-whisk
- Measuring spoons and cups
Ingredients
- 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
- 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.
- Whisk in 1 egg, 1 tablespoon lemon juice, and 1/3 teaspoon vanilla bean paste until slightly frothy.
- 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.
- Fold in about 2 1/2 tablespoons blueberries.
- Microwave on high 70–90 seconds until the top is set, springs back, and a toothpick comes out mostly clean.
- 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 (per serving, approx.):
- Calories: 277 kcal
- Protein: 10 g
- Carbs: 14 g
- Fat: 21 g (Sat Fat: 10 g)
- Fiber: 6 g • Sugar: 5 g
- Sodium: 630 mg • Cholesterol: 215 mg
- Potassium: 300 mg
Disclaimer
This recipe is provided for general information and entertainment only and is not medical or dietary advice. Nutrition values are estimates and can vary with specific ingredients and microwave power. Always use caution with hot mugs and fillings. Contains eggs, tree nuts, and dairy. For personalized guidance, consult a qualified professional.