Mixed berry overnight oats are the easiest make-ahead breakfast, and made really affordable using frozen berries. Just mix the ingredients together, chill, and wake up to a thick, creamy bowl of oatmeal. The frozen berries melt into the oats, adding natural sweetness, while Greek yogurt and protein powder make it extra satisfying and perfect for busy mornings or a lazy Breakfast Meal Prep.
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Why you'll love this recipe
No cook. Just like other my Biscoff Raspberry Overnight Oats and Mango Passionfruit, there's no cooking required!
Breakfast Meal Prep. Make multiple servings at once for a hassle-free, high-protein Breakfast option that lasts all week. Not a fan of sweet? Try Spinach Egg Bites or Protein Bagels instead.
Berries. Frozen mixed berries add natural sweetness and juicy bursts of flavour while melting into the oats overnight. It's also more affordable so you can have these oats and my Blueberry Lemon Oats at less cost!
Customizable. Easily switch up the milk, yogurt, or protein powder to fit your taste or dietary needs while keeping it creamy and delicious.
Ingredients and Substitutions
Rolled Oats. I prefer the texture of rolled oats mixed overnight with the liquids as it provides a creamier texture, similar to stovetop oats.
Chia seeds and yogurt. These ingredients help give the overnight oats a better texture. You can omit if you choose, but you could be unhappy with the texture.
Milk. Use milk of choice, I prefer creamier varieties like Cow's milk, soy or some oat milks.
Mixed Berries. To keep costs down, I prefer frozen berries. They also have the added benefit of seeping into the oatmeal overnight making the breakfast slightly sweeter.
Cinnamon. Cinnamon can help bring out the sweetness from the berries. Omit if you don't have (but I highly recommend).
Please check the recipe card for full list of ingredients and quantity.
Top Tip
Adjust Liquid for Desired Texture. Overnight oats thicken as they sit, so if they seem too thick in the morning, just add a splash of milk and stir.
Chia Seeds for Extra Creaminess. Chia seeds help absorb liquid and create a pudding-like consistency, so give them a good stir before refrigerating to prevent clumping.
Meal prepping overnight oats
Meal prepping frozen mixed berry overnight oats is an easy way to have a nutritious breakfast ready to go for busy mornings. It's why it's regularly included in my Weekly Meal Plans. Since the oats soften and absorb the flavours overnight, they actually get better the longer they sit!
Storing
Store overnight oats in airtight containers or jars (I like these Overnight Oats Jars as they have a spoon holder) in the fridge for up to 4 days. The longer they sit, the thicker they become, so stir in a splash of milk if needed before eating.
Are overnight oats eaten cold?
Overnight oats are meant to be eaten cold, but if you prefer them warm, microwave in 30-second bursts, stirring in between, until heated through. Add extra milk if they seem too thick.
I find the reheated overnight oats gives a very similar texture and taste to stovetop oats.
If you want more meal prep information, check out my Meal Prep for Beginners post and my Meal Prep Basics E-Book.
FAQs
Yes, fresh berries work well, but frozen berries release juices as they thaw, naturally sweetening and flavouring the oats. They're also more affordable and easier to get all year round which is why I recommend their use for this.
While overnight gives the best texture, you can eat them after about 4 hours if you're in a rush.
They may need more time to absorb the liquid, or they can be too watery if you don't add chia seeds and/or yogurt.
Use rolled oats instead of quick oats, and don’t overdo the liquid—stick to the recommended ratios for a good consistency.
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Or, you can have a browse through my Breakfast Meal Prep Category for more delicious eats.
Recipe
Frozen Mixed Berry Overnight Oats
Equipment
Ingredients
- 50 g (½ cup) rolled oats , see Note 1
- 30 g (2 tbsp) chia seeds , see Note 2
- 180 ml (¾ cup) milk , see Note 3
- 50 g (2 tbsp) yogurt of choice , optional, subs Note 4
- 30 g (1 scoop) protein , optional, natural or vanilla
- 1 teaspoon cinnamon
- 50 g (¼ cup) mixed berries frozen, see Note 5
Instructions
- Combine all ingredients into a container except for the mixed berries. Mix well.
- Add berries on top
- Store in the fridge for 4-5 days.
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