Best Sugar Free Gluten Free Low Carb Keto Mug Brownie

This is a quick and easy, fudgey sugar free keto mug brownie recipe that makes just 2 servings! This is an exclusive keto recipe from my new book The 30-Day Sugar Elimination Diet! This keto brownie recipe can be enjoyed on a keto diet or low carb diet at just 4 g net carbs per serving.

Keto Brownie Mug Cake

If you’ve got a sweet tooth and want a quick fix that won’t derail your goals, this low carb keto mug brownie is about to become your go-to. It’s rich, fudgy brownie perfection made in a microwave-safe mug in just about 60 seconds.

This single-serving dessert (well… technically 2 servings!) is perfect for portion control, especially when chocolate cravings hit hard. Unlike traditional mug cakes, this isn’t light and fluffy-it’s dense, moist, and truly tastes like the real deal chocolate brownie.

Even better? This sugar-free, gluten-free, low carb dessert fits beautifully into a low carb diet or keto lifestyle, with just 4 g net carbs per serving and simple ingredients you likely already have in your kitchen.

Keto Mug Brownie vs Traditional Mug Cakes

Most traditional mug cakes are made with refined flour and added sugar, which can spike blood sugar and leave you craving more.

This version:

• Uses almond flour or sunflower seed flour
• Contains no refined sugar or regular chocolate chips
• Is naturally low carb and keto-friendly
• Keeps you satisfied with healthy fats and protein

The result? A fudgy keto mug brownie recipe that satisfies without the crash.

Why You’ll Love This Recipe

• Quick cooking time – ready in about 1 minute
• Single serving dessert – no leftovers tempting you
• Low carb keto brownie mug cake with simple pantry ingredients
• Microwave or oven option
• Easy to make dairy free, nut free, and sugar-free
• Perfect when you want a special treat without overdoing it

Ingredient Swaps & Customizations

Make it Dairy-Free

You can easily turn this into a dairy-free keto mug brownie:

• Replace heavy cream → canned full-fat coconut milk
• Replace butter → coconut oil or even olive oil

This keeps it rich and moist while still being completely dairy free.

Make it Nut-Free

For those with a nut allergy, simply swap:

 Tip: Sunflower seed flour can sometimes turn slightly green due to a reaction with baking powder-totally safe and doesn’t affect taste!

Updated Sugar-Free Sweetener Options (No Swerve)

Since I no longer use Swerve, here are my preferred swaps:

 Tip:

•  My Sweetener Guide and Conversion chart can help you determine how much to use. 
• If using liquid stevia, start small (about 10–15 drops) and adjust
• For best taste and structure, a granular monk fruit blend gives that classic brownie texture

Chocolate Options

• Use sugar-free chocolate chips for extra richness
• Or skip them for fewer calories and still enjoy a deep chocolate flavor

What if I don’t like espresso powder?

You can leave it out, but it really enhances that deep dark chocolate flavor without tasting like coffee. 

Can I make this without a microwave?

Yes! The oven method works perfectly and gives a slightly more cake-like texture while still staying fudgy.

Can I double the recipe?

You can, but I recommend keeping it as a single-serving dessert for portion control and freshness.

Pro Tips for the Best Fudgy Mug Brownie

• Add a pinch of salt to balance sweetness
• Use a microwave-safe mug or small bowl for even cooking
• Microwave in 30-second intervals to avoid overcooking
• Don’t skip the espresso powder—it enhances chocolate flavor (no coffee taste!)
• Slightly undercook for that gooey fudgy brownie center

Storage Tips

• Store covered in the fridge up to 1 week
• Reheat for 30 seconds or enjoy chilled
• Texture stays soft and fudgy even after reheating

What is The 30-Day Sugar Elimination Diet?

My book, The 30-Day Sugar Elimination Diet, includes everything you need to go sugar-free for one full month. It’s a program to help you detox from sugar, eliminate cravings for sugar and carbs, balance your blood sugar to feel better and lose weight. Plus it has over 90 new low-carb and keto recipes! 

I tell you how to prepare for the plan, stock your kitchen and cook tasty meals that will leave you 100% satisfied all while weaning yourself off of sugar and without the nasty withdrawal symptoms!

Inside, you’ll find recipes for breakfasts, lunches and dinners, along with suggestions for snacks and sugar-free treats if you want them. Detailed shopping lists tell you everything you to buy. Detoxing from sugar couldn’t be simpler!

Reviews on Amazon

RoseieLB

5.0 out of 5 stars

 Very easy to follow. This is so well written.

I have a huge collection of books on health and wellness, healthy eating and of course, cookbooks. Im an RN and advocate for using nutrition to improve our health and prevent illness.

I am a strong proponent of eating sugar-free/low carb/keto. I’ve followed Brenda Bennett for a long time. And I have used many of her recipes.

However, this book is one of the best I’ve ever seen.

Her education about the benefits and theories of this life-style (I won’t use the word “diet”) is easy to read and comprehend.

The recipes are simple to follow, easy to prepare, and a minimum of ingredients.

She includes a fabulous 30 day eating plan which is so easy to follow. You will have a shopping list for pantry items. Then, with the recipes for 1 week you’ll have a list of other ingredients you’ll need. But only in the amount you need for that week. And leftovers are included so you won’t waste any ingredients or food.

My husband eats differently from me. So, I am often cooking for me. These recipes are perfect! Many of them are for 2 servings.

This is my favorite eating plan/cookbook. Lastly, I implore you to give up sugar! You can live without it. Your health will improve and your excess weight will come off. I’ve lived it for years. Congratulations Brenda. Well done!

bgailk

5.0 out of 5 stars

 At first glance/preview this plan looks doable

I’m looking for a way to get my pre-diabetic husband and myself off an overloaded sugar lifestyle. I’ve read through this book and think it’s doable because the recipes look uncomplicated – with ingredients I am familiar with and quick to prepare. They also look like the portions are enough to keep us from feeling deprived of food. I also like that this author has places I can look to for extra help and support. So here’s to success!

CamiJo

5.0 out of 5 stars

 Excellent Book! It’s the real deal!

Brenda’s the real deal and thus book is amazing! My journey to becoming sugar/gluten free started cold turkey in 2015 as I came to realize I had a sugar addition. I’ve personally experienced much of what Brenda shares in her book and on her blog, and her approach & tactics really work. I’ve tried several of her recipes and they’re legit good. This book is worth the buy!!

Tracy Cox

5.0 out of 5 stars

 Life Changing Plan

I started this program in Jan of this year with the 6 week Sugar Detox and Tribe Membership. Best decision I ever made. My A1C was 9.3. Today 11 months latter my A1C is 6.2. My Doctor is 100% behind this plan as well. I am almost at my first goal weight of 250 and went from size 26W plus to 20W. I challenge you to join the SugarFree Mom tribe!

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This easy dessert is one of my favorite ways to satisfy a craving without falling off track. Whether you’re following a low carb diet, keto lifestyle, or just trying to reduce sugar, this low carb keto mug brownie recipe hits that perfect sweet spot.

It’s fast, customizable, and truly tastes like a delicious brownie—no compromise needed.

Sugar-Free Low Carb Keto Mug Brownie