Protein Overnight Brownie Batter Recipe (vegan, gluten-free, nut free)

What is protein overnight brownie batter?

Think of overnight oats, but thicker, creamier and taste like cookie/cake/brownie batter. Bonus for it being sugar-free, high protein, vegan and gluten and nut free. Try it out — it’s delicious!

Why should I make this?

  • vegan
  • gluten free and nut-free
  • high protein
  • filling – you only need 1/4 cup oats!
  • perfect for better gut health and hormone balance
  • creamy, delicious, taste like dessert

Ingredients & Subsitutions

  • quick oats – the key to a smooth creamy texture (besides the milk). Quick oats make it more battery with some texture. Use gluten-free oats or regular rolled oats, and if you don’t have quick oats, traditional rolled oats work too.
  • protein powder — I use a scoop of vanilla protein powder and a little bit of unflavoured pea protein powder to balance the sweetness out. Feel free to use other flavours or types of protein powder and adjust the amount you want to add. If you don’t have protein powder, nut and seed butter are always an option to add more protein, but you’ll have to dial back the liquid by about 1/4 cup
  • Chia seeds — to make the batter “grow” and expand the size. Chia seeds also add fibre and lots of nutrients too. Flaxseeds are always a good substitute
  • Milk & Water – any kind of milk. For high-cal and higher protein, substitute the water for milk. Makes the recipe extra creamy. The amount of milk varies depending on your oats and protein powder
  • Optional: spices (I used cinnamon, cardamom, ground ginger),
  • flavours (cocoa / matcha / coffee / acai powder, lemon zest, vanilla / mint / coconut extract, fruits, etc)

Tips & Tricks

  • mix the dry ingredients well
  • add a few fewer wet ingredients at first. Once it reaches a thick batter texture, add another tablespoon or two of milk. That’s because the mixture will thicken in the fridge
  • I recommend letting the batter sit in the fridge for at least 3 hours for the best results
  • and taste test!! Everyone has different preferences.Sweet tooths out there may want to add more sweetener, while people who love creamy textures may want to use higher fat content milk and use oat flour instead of regular or quick oats

Q & A

How long can high protein overnight batter keep in the fridge?

About one week if the batter is kept in a airtight container

Can I use all water instead of milk?

Yes, but keep in mind that the batter will not be as creamy

Want more protein recipes? Try out this healthy high protein sugar free granola! (with low fat option)

Can I warm the high protein overnight brownie batter up?

Good question – I haven’t tried that yet. Please let me know how it came out if you tried it!

More Questions, Comments, Suggestions?

Feel free to shot me a comment down below – I’ll try my best to reply as soon as possible!

Want more?

Protein Overnight Brownie Batter Recipe (vegan, gluten free, nut free)

Recipe by I C CinnamonCourse: Breakfast, SnacksCuisine: AmericanDifficulty: Easy


Prep time


Cooking timeminutes



This healthy, creamy, delicious and dessert-like protein brownie batter is super easy to make and perfect for breakfast, pre and post workout snack, or even dessert!


  • 1/4 cup quick oats, gluten free if necessary

  • 1/4-1/3 cup vanilla vegan protein powder

  • 1/2 tbsp chia seeds/flaxseeds

  • 3/4 cup milk, any kind

  • 1/4 cup water

  • Optional: 1 tbsp cocoa powder, or other flavours (see Ingredients & Substitutions for ideas)
    Optional: Spices (I used each 1/4 tsp of cinnamon, cardamom and ground ginger)


  • In a medium size container, Mix all the dry ingredient together (oats, spices, seeds, protein powder, flavours)
  • Add 1/2 cup milk and 1/4 cup water and mix well. The texture should be very thick
  • add more milk to thin it out, one tablespoon at a time. The consistency should be like a pancake batter. As a rule of thumb, add another 2 tbsps. of milk after it reaches your desire consistency.
    Watch the video for reference
  • cover and refrigerate for at least 3 hours. This recipe will be able to keep in the fridge for up to one week

Recipe Video


  • depending on your oats and protein powder, you may need to adjust the number of wet ingredients
  • for more flavour ideas as well as substitutions, see Ingredients and Substitutions.
  • The nutrition facts below are used large flake oats and 1% milk (that’s where the sugar comes from – lactose)

Nutrition Facts

1 servings per container

Serving Size260g

  • Amount Per ServingCalories350
  • % Daily Value *
  • Total Fat 7g 11%
    • Saturated Fat 1.4g 7%
  • Cholesterol 9mg 3%
  • Sodium 100mg 5%
  • Potassium 440mg 13%
  • Total Carbohydrate 36g 12%
    • Dietary Fiber 5g 20%
    • Sugars 9g
  • Protein 42g 84%

    * The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

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