Some days I want chocolate right now, and this is the low-carb dessert I run to. This keto mug brownie is rich, fudgy, and unbelievably good for something that cooks in just a minute. Melted butter, cocoa, almond flour, and sugar-free chocolate chips come together to make a dessert that feels anything but “diet.” This sugar-free mug brownie is comfort in a cup.
When I tested this recipe (all eight times to get it just right…you know, for you guys), I couldn’t get over how much it tasted like the real deal.
In my book, it is the perfect single-serve dessert. (Though truth be told, I find it so filling that Skye and I usually share.) Soft in the middle, chewy around the edges, and packed with chocolate in every bite.
In my kitchen, this one’s on repeat. For a special treat, I’ve been known to serve this with a scoop of keto ice cream.
If you love it, you’ll also want to try my Keto Chocolate Mousse or Keto Chocolate Fat Bombs — both perfect for when your sweet tooth hits hard.
Let’s Talk Ingredients
In my kitchen, butter is non-negotiable for this keto mug brownie — it gives that rich flavor you just can’t fake. I tested this with coconut oil once, and while it works, the flavor doesn’t hit the same chocolate-brownie note.
For the sweetener, I’ve tried both allulose and a monk fruit-erythritol blend. Allulose melts right in and gives the brownie that classic fudgy texture. The monk fruit version is still delicious but has a slightly crisper edge. I didn’t test this with Swerve, but my guess is that it would work.
I use almond flour because it keeps the brownie tender and light. Don’t swap in coconut flour. It’s too absorbent and throws off the texture.
The collagen protein adds body and makes the brownie feel more like a “real” one. If you skip it, the brownie will still work, just a bit softer. We tried it with whey protein, and no one around here was a fan.
You can use any keto-friendly chocolate chips - Lily’s is the brand I use in all of my keto recipes.
I didn’t include nuts in the recipe to keep the carbs lower, but both pecans and walnuts are perfect here.
Step-by-Step
See the recipe card below for the full recipe.
Troubleshooting
Too gooey or still batter-like?
Yep, been there. This happens when your microwave wattage runs hotter or colder than mine. When I tested it, I found that 60 seconds is my sweet spot, but sometimes it needs another quick burst, just 10 seconds at a time. Don’t walk away; this brownie can go from fudgy perfection to overdone so fast.
Dry or crumbly edges?
This means you’ve overcooked it . You want to stop microwaving when the middle still looks a little glossy. It’ll finish setting as it cools.
Oil pooling or weird separation?
If your mug looks like a science experiment gone wrong, it’s probably over-measured almond flour or butter that wasn’t fully mixed in. Collagen changes the structure a bit, so you’ve got to stir like you mean it.
Keto Mug Brownie
Ingredients
- 1 tablespoon butter
- 2 tablespoons keto chocolate chips divided
- 1 egg beaten
- ¼ cup allulose or 2.5 tablespoon monk fruit/erythritol
- 1 tablespoon almond flour
- 1 tablespoon collagen protein
- 1 ½ tablespoons unsweetened cocoa powder
- ¼ teaspoon baking powder
- ¼ teaspoon vanilla extract
- 1 pinch sea salt
Instructions
- Place the butter and 1 tablespoon of the chocolate chips in a cup or ramekin and melt. Stir well.
- Add the egg, sweetener, almond flour, cocoa powder, and vanilla. Stir to combine. Fold in the chocolate chips, leaving a few to sprinkle on top if desired.
- Microwave for 60 seconds. If not done, continue to cook in 10-second intervals.
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