Sugar-Free 3-Ingredient Mug Cake
Sugar-Free 3-Ingredient Mug Cake
A warm, dark chocolate cake for one, mixed in the mug and microwaved in about a minute
This sugar-free 3-ingredient mug cake is warm, dark and properly cakey — chocolate-hazelnut spread, an egg and almond flour, whisked in a mug and microwaved until the spoon lifts a soft, moist slice like the photo.
Estimated per mug: 290 calories, 9g protein and 6g net carbs. Ready in about 5 minutes.
Why you'll love this 3-ingredient mug cake
- Just 3 ingredients — no pantry raid required
- Completely sugar-free with sugar-free chocolate spread
- Warm chocolate cake in about 5 minutes, start to spoon
- Single serving — no whole cake calling from the kitchen
- Soft, moist crumb just like the spoonful in the photo
- Mixed and cooked in the same mug — almost no washing up
Health notes
- Sugar-free chocolate-hazelnut spread: The sweetness, chocolate and fat all in one ingredient — read the label for hidden sugar.
- Egg: The lift, structure and protein.
- Almond flour: Low-carb crumb instead of wheat flour.
- Built-in portion: One mug, one serving — dessert maths done for you.
- Estimated macros: No nutrition card came with this one, so values are estimated and kept consistent throughout.
Key element — stop while the centre is just set
Microwave mug cakes go from perfect to rubbery in about 15 seconds. Pull it when the top looks set but the centre still has a slight jiggle — it finishes cooking as it rests, and stays moist like the photo.
Ingredients
The 3 ingredients
- ¼ cup sugar-free chocolate-hazelnut spread
- 1 large egg, room temperature
- 2 Tbsp almond flour
Optional, not counted
- Pinch of salt or ¼ tsp vanilla — lovely, but then it isn't 3-ingredient any more
- Sugar-free whipped cream or a few berries, to serve
- 1 tsp sugar-free chocolate chips, sprinkled on top
Swaps
- Peanut butter version: Swap the spread for sugar-free peanut butter and add the optional chips — the 3-ingredient count stays.
- No almond flour: Use 1 Tbsp coconut flour instead; the cake will be a little firmer.
- Oven: Bake in a ramekin at 350°F for 10–12 minutes.
Instructions
| 1 | Pick your mug. Use a microwave-safe mug of at least 12 oz — the cake rises as it cooks. No need to grease it. |
| 2 | Soften the spread. Spoon the chocolate-hazelnut spread into the mug and microwave for 15 seconds so it stirs easily. |
| 3 | Whisk in the egg. Crack in the egg and whisk with a fork until completely smooth and glossy, with no streaks of white. |
| 4 | Add the almond flour. Stir in the almond flour until just combined. Scrape the sides and smooth the top. |
| 5 | Microwave. Microwave on high for 60 seconds. Check: the top should look set with a slight jiggle in the centre. If it's still wet, add 10–15 seconds at a time — most microwaves need 70–90 seconds total. |
| 6 | Rest and eat. Rest for 1 minute (it sets and stays moist). Use an oven mitt — the mug is hot. Eat warm, straight from the mug with a spoon, exactly like the photo. |
Pro tips
- Just set, not solid — overcooked is the only way to ruin this.
- Every microwave differs; learn yours once and it's perfect forever.
- Room-temperature egg mixes smoother and cooks more evenly.
- A bigger mug stops overflow — the batter roughly doubles as it cooks.
- Eat it within a few minutes; mug cakes firm up as they cool.
Nutrition
| Nutrient | Per mug (est.) |
|---|---|
| Calories | 290 |
| Protein | 9g |
| Net carbohydrates | 6g |
| Total carbohydrates | 10g |
| Fiber | 4g |
| Total fat | 23g |
| Sodium | 95mg |
Estimated for one mug cake, based on sugar-free chocolate-hazelnut spread, one egg and almond flour. Exact macros vary a lot by spread brand — check yours.
Variations
Peanut butter
Sugar-free peanut butter instead of hazelnut spread, chips on top.
Double chocolate
Drop a square of sugar-free chocolate into the centre before microwaving for a molten middle.
For two
Double everything into two mugs and microwave one at a time.
Oven-baked
Ramekin, 350°F, 10–12 minutes — a firmer, more cake-like crumb.
Storage
| Method | Time | Notes |
|---|---|---|
| Best | Immediately | Mug cakes are a make-and-eat dessert — texture fades fast |
| Refrigerator | Up to 1 day | Covered; reheat 15–20 seconds to soften |
| Freezer | Not recommended | The crumb goes rubbery; it's 5 minutes fresh instead |
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