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    Home » Recipes » Mug Cakes

    Oat Flour Mug Cake

    Published: Apr 3, 2023 by Crystal Yentzen · This post may contain affiliate links · 3 Comments

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    Oat flour mug cake in a pink mug with whipped cream and sprinkles

    Looking for something sweet and healthy? Look no further than this oat flour mug cake! This personal-sized cake is light and fluffy and made with wholesome ingredients. Go ahead and indulge your sweet tooth!

    oat flour mug cake in a pink mug topped with whipped cream and sprinkles

    I love mug cake! It's such a quick and easy dessert. And I've tried so many different recipes, but this oat flour cake is my favorite.

    It cooks up light and fluffy- you won't believe it's made in a microwave. Plus, the ingredients are easy to find and good for you. Here's what you'll need:

    Jump to:
    • Ingredients:
    • Instructions
    • FAQs
    • Want more mug cake recipes?
    • 📖 Recipe
    • 💬 Comments

    Ingredients:

    To make this oat flour mug cake, you'll need the following ingredients:

    ingredients to make an oat flour mug cake

    Ingredient notes:

    • Oat Flour–  Oat flour is sold in stores, but it’s also super easy to make at home. Simply blend old-fashioned oats in a high-speed blender until the oats become a fine powder (about 30 seconds to a minute). Store your oat flour in an air-tight container for up to three months. 
    • Coconut Sugar- Feel free to substitute regular brown sugar instead of coconut sugar.
    • Grass-Fed Butter- I use grass-fed butter for the health benefits but feel free to use regular butter. Or you can substitute olive or canola oil.
    • Sparkling Water- I tested the mug cake using sparkling water and regular water, and I found that using sparkling water created a lighter, fluffier cake. But feel free to use regular water if that's what you have. 

    Instructions

    Oat flour mug cake is super easy to make. Follow these instructions:

    oat flour, baking soda, coconut sugar, and salt in a mug
    cake batter in a mug
    baked mug cake
    • Mix the oat flour, cornstarch, coconut sugar, baking powder, and salt in a small microwave-safe mug or ramekin.
    • Add in the melted butter, vanilla extract, and water. Mix together with a spoon until everything is well incorporated.
    • Microwave on high for 50-60 seconds. Mine is perfect at 55 seconds.
    • Allow to cool and top it with your favorite toppings, such as whipped cream or nut butter.

    FAQs

    Can I make my own oat flour?

    Yes! Oat flour is simple to make at home. Simply blend old-fashioned oats in a high-speed blender until the oats become a fine powder (about 30 seconds to a minute). Store your oat flour in an air-tight container for up to three months. 

    Can I add chocolate chips or nuts?

    Yes! You can customize your mug cake with various nuts and chocolate chips. Add them to the batter before microwaving, or use them as toppings.

    a close-up shot of a bite of mug cake

    Want more mug cake recipes?

    Check these out!

    Powdered Peanut Butter Mug Cake (4 Ingredients)

    Double Chocolate Protein Mug Cake (made with oats)

    Vegan Funfetti Mug Cake

    As always, please let me know how you like the oat flour mug cake in the comments. Your feedback means a lot to me, and your star ratings encourage other readers to give this recipe a try.

    Enjoy!

    Crystal

    📖 Recipe

    oat flour mug cake in a pink mug with whipped cream and sprinkles
    Print Recipe
    5 from 4 votes

    Oat Flour Mug Cake

    Looking for something sweet and healthy? Look no further than this oat flour mug cake! This personal-sized cake is light and fluffy and made with wholesome ingredients. Go ahead and indulge your sweet tooth!
    Prep Time4 minutes mins
    Cook Time1 minute min
    Total Time5 minutes mins
    Course: Dessert
    Cuisine: American
    Keyword: mug cake, Oat flour
    Servings: 1 person
    Calories: 357kcal
    Author: Crystal Yentzen

    Ingredients

    • ⅓ cup oat flour*
    • 1 tablespoon cornstarch
    • 1 and ½ tablespoons coconut sugar or brown sugar
    • ¼ teaspoon baking powder
    • pinch salt
    • 1 tablespoon grass-fed butter melted, or olive or canola oil
    • ¼ teaspoon vanilla extract
    • 2 tablespoons sparkling water* or regular tap water, see notes

    Instructions

    • Mix the oat flour, cornstarch, coconut sugar, baking powder, and salt in a small microwave-safe mug or ramekin.
    • Add in the melted butter, vanilla extract, and water. Mix together with a spoon until everything is well incorporated.
    • Microwave on high for 50-60 seconds. Mine is perfect at 55 seconds.
    • Allow to cool and top it with your favorite toppings, such as whipped cream or nut butter.
    • Enjoy!

    Notes

    1. Oat Flour–  Oat flour is sold in stores, but it’s also super easy to make at home. Simply blend old-fashioned oats in a high-speed blender until the oats become a fine powder (about 30 seconds to a minute). Store your oat flour in an air-tight container for up to three months. 
    2. Sparkling Water- I tested the mug cake using sparkling water and regular water, and I found that using sparkling water created a lighter, fluffier cake. But feel free to use regular water if that's what you have. 

    Nutrition

    Calories: 357kcal | Carbohydrates: 51g | Protein: 6g | Fat: 15g | Saturated Fat: 8g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 4g | Trans Fat: 0.5g | Cholesterol: 30mg | Sodium: 138mg | Potassium: 254mg | Fiber: 3g | Sugar: 13g | Vitamin A: 350IU | Calcium: 70mg | Iron: 2mg

    More Mug Cakes

    • Powdered peanut butter mug cake
      Powdered Peanut Butter Mug Cake (4 Ingredients)
    • Double Chocolate Protein Mug Cake (made with oats)
      Double Chocolate Protein Mug Cake (made with oats)
    • Vegan Funfetti Mug Cake
      Vegan Funfetti Mug Cake

    Reader Interactions

    Comments

    1. Jess says

      April 06, 2023 at 1:06 am

      5 stars
      So delicious and easy to make

      Reply
    2. Gina Abernathy says

      April 06, 2023 at 1:45 am

      5 stars
      I love mug cakes. They are the perfect size for dessert and for those nights or afternoons I just need a little something special.

      Reply
    3. Nancy says

      April 06, 2023 at 3:58 pm

      5 stars
      I really need to try this mug cake trend. Yours looks fantastic

      Reply

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    Hi, I'm Crystal! Welcome to Dessert Done Light, where I share healthy dessert, snack, and breakfast recipes. If you're looking for a healthy treat, you're in the right place!

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