I can’t get over how this keto coconut flour mug cake turns out so soft, vanilla-kissed, and bakery-worthy with just 4.9g net carbs. That creamy coconut frosting makes it feel like a birthday cake secret hiding in a 90-second dessert.

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I’m obsessed with this Coconut Flour Mug Cake because it hits that cake craving fast without dragging me into a sugar crash. I love how coconut flour gives it that soft, slightly dense bakery bite, while vanilla extract keeps it tasting like an actual treat, not “diet dessert.” And that coconut frosting?

I could eat it straight, no shame. This is my low carb birthday-cake-in-a-mug situation when I want something sweet, simple, and still keto.

But the best part is the texture: tender, rich, and satisfying enough that I don’t feel like I’m settling. Tiny cake.

Big mood. Full stop.

Ingredients

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Coconut flour soaks up moisture fast, giving the mug cake its tender, cakey bite.

Powdered keto sweetener keeps it dessert-like without that sugar crash later.
Baking powder helps it puff up, so it doesn’t feel like sweet scrambled eggs.
A tiny pinch of salt makes the vanilla and coconut taste way more alive.
Eggs bring structure, protein, and that soft, spongey mug cake texture.
Almond milk loosens the batter and keeps things light, not heavy.
Melted butter adds richness, while coconut oil leans into the tropical vibe.
Vanilla makes everything taste warmer, sweeter, and honestly more bakery-like.
Cream cheese frosting gives tangy, creamy balance to the coconut-heavy cake.
Coconut cream makes the frosting lush, smooth, and a little extra fancy.
Plus shredded coconut adds chewy texture and makes the top look cute.

Ingredient Quantities

3 tablespoons coconut flour

2 tablespoons powdered erythritol or preferred keto powdered sweetener

1/4 teaspoon baking powder

pinch of salt

2 large eggs

3 tablespoons unsweetened almond milk (or other low carb milk)

1 tablespoon melted butter or coconut oil

1 teaspoon vanilla extract

For the coconut frosting: 2 tablespoons cream cheese, softened

1 tablespoon coconut cream

1 tablespoon powdered erythritol

1/4 teaspoon vanilla extract for the frosting

1 teaspoon unsweetened shredded coconut, optional for topping

How to Make this

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1. In a small bowl whisk together 3 tablespoons coconut flour, 2 tablespoons powdered erythritol, 1/4 teaspoon baking powder and a pinch of salt until uniform.

2. In a separate bowl beat 2 large eggs lightly, then stir in 3 tablespoons unsweetened almond milk, 1 tablespoon melted butter or coconut oil and 1 teaspoon vanilla extract.

3. Pour the wet mixture into the dry ingredients and stir thoroughly, breaking up any lumps, until a thick smooth batter forms.

4. Transfer the batter to a greased microwave safe mug or ramekin, scraping the bowl so no batter is wasted.

5. Microwave on high for 90 seconds to 2 minutes, watching closely after 90 seconds; cake should be set on top and spring back when touched.

6. Allow the mug cake to cool for 2 to 3 minutes so it firms up and is safe to handle.

7. While the cake cools make the coconut frosting by beating together 2 tablespoons softened cream cheese, 1 tablespoon coconut cream, 1 tablespoon powdered erythritol and 1/4 teaspoon vanilla extract until smooth and fluffy.

8. If the frosting is too thick loosen with a few drops of almond milk; if too thin chill briefly to thicken.

9. Spread the frosting over the slightly cooled mug cake and sprinkle 1 teaspoon unsweetened shredded coconut on top if desired.

10. Serve immediately and enjoy.

Equipment Needed

1. Small mixing bowl
2. Whisk or fork
3. Measuring spoons and tablespoon measurements
4. Measuring cup for liquid (3 tablespoons)
5. Microwave safe mug or ramekin
6. Nonstick spray or small amount of butter for greasing
7. Rubber spatula or spoon for scraping batter
8. Small bowl and hand mixer or handheld whisk for frosting
9. Teaspoon for sprinkling shredded coconut and for tasting

FAQ

Q: How long do I microwave the mug cake and at what power? A: Microwave on high for 60 to 75 seconds. Start with 60 seconds, then add 10 to 15 second bursts if it looks wet on top. Cooking time varies by microwave wattage.

Q: Can I bake this in the oven instead of microwaving? A: Yes. Pour batter into a small ramekin and bake at 350 F for 12 to 18 minutes, or until a toothpick comes out clean. Baking yields a slightly firmer crumb.

Q: Why does coconut flour make the cake dense or dry sometimes? A: Coconut flour is highly absorbent, so accurate measuring and enough liquid and eggs are essential. If it seems dry, add 1 tablespoon extra almond milk or one more egg white and reduce microwave time slightly.

Q: Can I make this vegan or egg free? A: Egg substitutes are tricky with coconut flour because eggs provide structure. Try 1 tablespoon ground flax mixed with 3 tablespoons hot water per egg as a starting point, but texture will be different and may require additional liquid and longer cooking.

Q: How do I store leftovers and how long do they keep? A: Store unfrosted cake in an airtight container in the refrigerator for up to 3 days. Frosted cake keeps 2 to 3 days refrigerated because of the cream cheese frosting. Reheat briefly in the microwave to serve warm.

Q: Can I customize the frosting or skip it for fewer carbs? A: Yes. For fewer carbs skip the frosting or use a dollop of heavy cream whipped with a pinch of powdered erythritol. You can also fold in a teaspoon of cocoa powder, lemon zest, or a few sugar free chocolate chips into the batter for variation.

Coconut Flour Mug Cake Recipe Substitutions and Variations

Coconut flour: 1) Almond flour at 1:1 volume but reduce to 2 tbsp and add one extra egg for structure; 2) Oat fiber 1:1 volume with no other changes (keeps low carb texture).
Powdered erythritol: powdered monk fruit or allulose 1:1; or powdered stevia at much lower amount, start with 1/8 tsp and adjust to taste.
Unsweetened almond milk: unsweetened coconut milk 1:1, or dilute heavy cream with water 1:1 for a richer result (use same volume).
Cream cheese in frosting: mascarpone or softened coconut cream 1:1 by volume; if using coconut cream, chill to thicken before whipping.

Pro Tips

1. Coconut flour drinks up liquid fast, so measure carefully and resist the urge to add more milk if batter looks dense; a thick batter is normal and yields a tender cake.
2. Microwave power varies a lot, so start checking at 90 seconds and add 10 to 15 second bursts if needed. Overcooking makes the cake dry, so aim for just set and slightly springy.
3. Let the mug cake rest for a couple of minutes before frosting. That short cool-down time prevents the frosting from melting into the cake and gives a nicer texture.
4. If your frosting is grainy from the sweetener, blitz it briefly in a small blender or whisk vigorously with a spoon; a drop or two of warm milk will help it smooth out without thinning too much.
5. For more flavor depth, add a pinch of cinnamon or a few drops of almond extract to the batter, or fold in a half teaspoon of unsweetened shredded coconut for extra texture.

Coconut Flour Mug Cake Recipe

Recipe by Dave Simpson

0.0 from 0 votes

Servings

servings

Calories

251

kcal

Equipment: 1. Small mixing bowl
2. Whisk or fork
3. Measuring spoons and tablespoon measurements
4. Measuring cup for liquid (3 tablespoons)
5. Microwave safe mug or ramekin
6. Nonstick spray or small amount of butter for greasing
7. Rubber spatula or spoon for scraping batter
8. Small bowl and hand mixer or handheld whisk for frosting
9. Teaspoon for sprinkling shredded coconut and for tasting

Ingredients

3 tablespoons coconut flour
2 tablespoons powdered erythritol or preferred keto powdered sweetener
1/4 teaspoon baking powder
pinch of salt
2 large eggs
3 tablespoons unsweetened almond milk (or other low carb milk)
1 tablespoon melted butter or coconut oil
1 teaspoon vanilla extract
For the coconut frosting: 2 tablespoons cream cheese, softened
1 tablespoon coconut cream
1 tablespoon powdered erythritol
1/4 teaspoon vanilla extract for the frosting
1 teaspoon unsweetened shredded coconut, optional for topping

Directions

In a small bowl whisk together 3 tablespoons coconut flour, 2 tablespoons powdered erythritol, 1/4 teaspoon baking powder and a pinch of salt until uniform.
In a separate bowl beat 2 large eggs lightly, then stir in 3 tablespoons unsweetened almond milk, 1 tablespoon melted butter or coconut oil and 1 teaspoon vanilla extract.
Pour the wet mixture into the dry ingredients and stir thoroughly, breaking up any lumps, until a thick smooth batter forms.
Transfer the batter to a greased microwave safe mug or ramekin, scraping the bowl so no batter is wasted.
Microwave on high for 90 seconds to 2 minutes, watching closely after 90 seconds; cake should be set on top and spring back when touched.
Allow the mug cake to cool for 2 to 3 minutes so it firms up and is safe to handle.

While the cake cools make the coconut frosting by beating together 2 tablespoons softened cream cheese, 1 tablespoon coconut cream, 1 tablespoon powdered erythritol and 1/4 teaspoon vanilla extract until smooth and fluffy.
If the frosting is too thick loosen with a few drops of almond milk; if too thin chill briefly to thicken.
Spread the frosting over the slightly cooled mug cake and sprinkle 1 teaspoon unsweetened shredded coconut on top if desired.
Serve immediately and enjoy.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.