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Single-Serve Vegan Oatmeal Cookie in a Mug

Oatmeal Cookie in a Mug with only 5 ingredients needed! This easy single-serve dessert recipe requires 5 minutes and no baking.

4-Ingredient Oatmeal Cookie in a Mug with a bite taken out

You know where this is going.

It’s a Friday night, you’re ultra pumped about how hard you sweated in hot pilates class this week, you can feel an aching in your bones for something sweet and oatmeal-esque but you don’t want a full batch of cookies lurking around your counter space, you then…

Bake a single-serve oatmeal cookie in a mug.

This one is gluten-free, dairy-free, studded with chocolate chips, and has that amazing oatmeal flavor. 

Plus it’s ready in less than 5 minutes…not shabby for those times you have a hankering for a little something luscious.

Let’s make it!

Add the gluten-free flour, coconut sugar, baking soda, oats, coconut oil, water, and sea salt to a mug or measuring cup and stir well until a thick dough forms.

Ingredients for oatmeal cookie in a measuring cup

Stir in the chocolate chips (if adding).

Oatmeal cookie ingredients in a mug with chocolate chips

Microwave on high 40 to 60 seconds, until cookie has set up.

Dive in with a spoon and enjoy!

Baking Instructions:

If you don’t own or operate a microwave, no problem! Simply stir up all of the ingredients in a mug, place the mug on a cookie sheet, and bake at 350 degrees F (preheated) for 25 to 30 minutes. Allow the mug to cool before diving in!!

That single-serve dessert life!

More Single-Serve Desserts in a Mug:

My cookbook, Paleo Power Bowls, is now available! CLICK HERE to check it out. Thank you for your support!

If you make this recipe, please feel free to share a photo and tag @The.Roasted.Root on Instagram!

Oatmeal Cookie in a Mug

Gluten-free oatmeal cookie in a mug with chocolate chips – made with only a few basic ingredients. Vegan!
Prep Time: 5 minutes
Cook Time: 1 minute
Total Time: 6 minutes
1 mug cookie


Optional Add-ins


  • Add all ingredients in the order in which they appear to a microwave-safe mug or measuring cup. Stir in the chocolate chips (if adding).
  • Microwave on high 40 to 60 seconds, until cookie has set up.
  • Allow cookie to cool for 1 minute before enjoying.


*I have found various gluten-free flour blends have different absorbencies so the results may vary depending on what brand of GF flour you use. I use Bob’s Red Mill Gluten-Free 1-to-1 Baking Flour but have found the recipe results in a greasier cookie when I use Pamela’s. 
For a smaller cookie, make this recipe:
  • 3 Tbsp gluten-free all-purpose flour
  • 2 Tbsp quick oats or rolled oats
  • 1.5 Tbsp sugar
  • 2 Tbsp avocado oil
  • 1 Tbsp water
  • Pinch sea salt
  • Pinch ground cinnamon
Microwave for 60 seconds. 


Serving: 1cookieCalories: 796kcalCarbohydrates: 78gProtein: 3gFat: 54gFiber: 2gSugar: 45g
Course: Single-Serve Desserts
Cuisine: American
Keyword: coconut oil, coconut sugar, oatmeal, quick oats
Servings: 1 mug cookie
Calories: 796kcal
Author: Julia
Single-Serve Oatmeal Cookie in a Mug - gluten-free, refined sugar-free, dairy-free, vegan, egg-free

Recipe Rating

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Monday 4th of March 2024

If you followed this recipe and didn’t read the comments until after like me, here’s how I saved my cookie: 1) stir the hot cookie soup back together 2) use a spoon to hold the solids back while you drain the extra grease , I honestly drained about 3 tbsp out of mine 3) after you’ve drained as much as possible from both sides of the mug, you should have a decently solid dough you can slap on a plate and throw in the fridge/freezer for a little bit and you’ll have a somewhat edible cookie !


Monday 4th of March 2024

Hi Rosie,

Did you use gluten-free all-purpose flour? If so, which brand? Did you make any other changes to the recipe, like reducing the amount of coconut sugar?


Saturday 18th of November 2023

Too sweet, and soooo much oil, I actually poured it off the top when I took it out of the microwave. Something isn’t right…


Saturday 14th of October 2023

Yeah gonna just add to the chorus here—this did not work at all. So disappointing.


Sunday 10th of September 2023

This didn’t set. I suspect that there is an error in the amount of coconut oil stated in your recipe… ?? 4 TBSP is an awful lot for a single serving. Should it be tsp instead?


Monday 31st of July 2023

Taste is kinda ok but its wayyyyy too greasy. I even had to remove excess oil with a tissue. Followed exact recipe once or twice and always same result.

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