For breakfast, I usually make a simple dish of rolled oats, yogurt, milk and fruit. These lemon blueberry overnight oats are so creamy, bright and ready when you wake. They can be made in advance, so they are perfect for busy mornings. It tastes like a muffin in a jar but so much lighter. I started making these in 2024 when I was getting sick of eating rushed breakfasts of cold toast. Since then I have tweaked the amounts of lemon, sweetness and thickness several times and this is the recipe that I always go back to. It’s a very simple recipe, with no cooking, no pan to wash up and no washing up at all. It takes just a few minutes of mixing the night before and then it’s ready to eat in the morning.
Why these lemon blueberry overnight oats are worth making
These make-ahead breakfasts are very good indeed. The lemon in this recipe keeps the flavor clean and fresh so that the oats never taste heavy or overly sweet. The yogurt in this recipe adds a lovely tang to the oats as well as giving them some staying power. No stove, no pan, no washing up. It is made in a jar, so you can mix it, put the lid on and leave it in the fridge. It can make enough for several breakfasts, so you can enjoy your breakfast with ease on several days. As of 2025 I’ll be enjoying these on weekdays too. They are incredibly easy to make and the fruit can be swapped for whatever is in season.
A few thoughts on the ingredients
I used rolled oats (old-fashioned oats) for this recipe as they have a nice chew to them after soaking in the liquid and absorb liquid at a steady rate. I tried instant oats and found that they became very mushy and pasty and steel-cut oats were too firm even after soaking in liquid for several hours. These oats are so creamy because I used a mixture of plain Greek yogurt and milk. The yogurt gives the oats lots of body and tang, while the milk helps to thin the mixture out so that the oats can absorb the liquid and soften up. Any milk will do, whether dairy, oat, almond or soy. However, I think that a thicker, unsweetened milk would be best. The chia seeds are optional, but they do swell up and help to thicken up the oats as they sit. The lemon juice and zest are the main ingredients of this breakfast. I used fresh lemon, as bottled juice can taste flat and even sometimes bitter. The zest is also really good as it contains fragrant oils that the juice doesn’t have. If you can get hold of unwaxed lemons then use them. I used honey to sweeten the oats, but maple syrup would also be good. I added a drop of vanilla extract too. Fresh blueberries are best but frozen blueberries also work well. Frozen blueberries release a lot of deep purple juice as they thaw, which then streaks the oats. They are also often cheaper than fresh blueberries in the out of season months. Wash fresh blueberries just before you use them.
How the dish comes together
I start with the jar, because that saves a bowl. First, I put the oats in the jar, then the chia seeds and a pinch of salt. Next, I add the yogurt, milk, lemon juice, zest, honey and vanilla and stir everything together until the mixture resembles a pale batter with no dry oats lurking at the bottom of the jar. As the oats and chia seeds start to absorb the liquid, the smell of fresh, bright lemon starts to rise above the soft, milky scent of the oats. It looks thin but don’t worry, it will thicken up overnight. Fold in about half of the blueberries to the mixture, and then top with the remaining blueberries. If using frozen blueberries, then they can be added straight from the freezer to the jar. Press the lid on the jar and give it a good shake. Slide it into the fridge for the night. The next morning the oats will have swollen up and soaked up all of the liquid. The surface of the oats should look set and slightly shiny. There may be a few berries that have burst and colored the oats slightly, but that is to be expected. I give the jar a good stir to mix everything together, then if the oats feel a bit too stiff I add a splash of milk to loosen them up. Finally I top with a few more fresh blueberries and some extra honey.
How to tell it is ready
Look at the texture. The oats should be plump and creamy with no pool of liquid on top. They should not feel hard in the middle when you take a bite of one. The spoon should stand up straight for a moment before falling over. The oats should be soft and tender to the bite, not hard and gritty. They should have a hint of lemon flavor but not be too tart. The sweetness should be subtle, not too sweet. If the oats are too thick then add a splash of milk. If they are too thin then leave them for a bit longer or add a spoonful of oats. The lemon blueberry overnight oats should have a fresh citrusy aroma with a hint of vanilla.
Tips for the best lemon blueberry overnight oats
Mix well before placing in the fridge to allow the oats to soak up the liquid as evenly as possible. Mix again the following morning before serving. Add lemon juice slowly to taste. All lemons are different and you don’t want to end up with a yogurt that has curdled slightly. Use a jar with a tight fitting lid to stop the oats from going stale and from taking on any unwanted fridge smells. Any crunchy toppings should be added just before serving as they will soon become soggy. Keep the blueberries on top of the jar rather than mixing them in with the oats if you are making several jars of these overnight oats for the week. This will stop the oats from turning purple and the berries from becoming squashed.
Troubleshooting
If the oats are too thick, stir in a splash of milk until they are the desired consistency. If they are too runny, you may have used too much liquid or not left them to soak long enough. You could try leaving them for a few more hours or adding a bit more chia seeds. If the oats taste too tart then add a little more honey. If they taste a little bland then add a pinch of salt and maybe a little more lemon zest. If the yogurt looks a bit grainy then you have added too much lemon juice too quickly. Just stir well to combine and add the lemon juice more slowly next time. If the oats taste raw then they need more time in the fridge.
Serving ideas
I like to eat these cold, straight from the jar, with a few more blueberries on top, and maybe even a little more lemon zest. If you like, you can even add a spoonful of extra yogurt on top, and maybe some crunchy almonds or granola too. These make great lunchbox food, perfect for picnics too as they can be transported in a jar with a lid. Serve with a boiled egg or a slice of wholegrain toast for a more substantial breakfast. Some people like to eat these warm too, just heated in the microwave for a short while until they are soft and porridge-like.
Variations
I would like to try these with raspberries, strawberries or chopped up peaches instead of the blueberries. Almond butter would be good instead of the honey and you could add some shredded coconut too. Instead of the lemon you could use orange and add some cinnamon or even cardamom for a warm, cozy breakfast. You could also add a scoop of vanilla protein powder and some more milk for an extra protein boost. If you are making these vegan then use a plant-based yogurt and milk instead of the dairy ones and use maple syrup instead of honey.
Storage and make-ahead
Store in the fridge at 4 °C (40 °F) or below for up to 4 days. As the oats contain dairy, it is best not to leave them out at room temperature for more than 2 hours. In hot weather, it is best to throw them away after 1 hour out of the fridge. If you have been carrying the jar around in a warm bag then it is best to throw it away as soon as possible. These make-ahead breakfasts can be made in advance for a week of breakfasts. Just remember to add any fresh fruit and toppings on the morning you eat them. They do not freeze well, as they become watery and grainy when defrosted. You can, however, use frozen blueberries to make these. Always use a clean spoon to serve up from a shared jar. If the oats smell sour or look slimy then it is best to throw them away. When in doubt throw it out.
FAQs
Can I use steel-cut oats?
Not without cooking them first. They stay hard in the fridge, so rolled oats are a better choice.
Do I have to use yogurt?
No. You can use extra milk, but the oats will be thinner and less tangy.
Can I eat them warm?
Yes, simply heat them up in the microwave for a minute or so, stirring halfway through, then add a little milk if required.
Why are my oats too sweet or too sour?
Taste them before putting them in the fridge to allow for adjustment. Remember that cold dulls sweetness slightly.
Can I use frozen blueberries?
Yes, frozen blueberries can be used in these overnight oats. They will even tint the oats as they thaw in the fridge overnight.
Are overnight oats suitable for meal prep?
These make-ahead breakfasts are very good indeed. The lemon in this recipe keeps the flavor clean and fresh so that the oats never taste heavy or overly sweet. The yogurt in this recipe adds a lovely tang to the oats as well as giving them some staying power.
Can I make them vegan?
Yes. Use a plant-based yogurt and milk, and swap the honey for maple syrup.
A Note From My Kitchen
I used to hate overnight oats as I found them so bland and gluey. These on the other hand are totally different. Just measure carefully, stir well and leave in the cold for the night. That is all. Then you can add whatever fruit you like to make them your own. I’d love to hear how you get on with these, so please do leave a star rating and a comment below, and let me know if you make any changes.
Lemon Blueberry Overnight Oats: Creamy, Bright and Ready When You Wake
Description
These lemon blueberry overnight oats combine rolled oats, Greek yogurt, milk and chia seeds with fresh lemon juice, zest and sweet blueberries. They soak in the fridge overnight with no cooking, giving you a creamy, bright breakfast with 17 g of protein per serving that is ready the moment you wake.
For the oats
Instructions
-
Method
- Prepare 4 jars: set out four 350 ml jars with lids.
- Combine the dry ingredients: divide the oats, chia seeds and salt between the jars (50 g oats and 1 tbsp chia per jar).
- Mix the wet ingredients: in a large jug, whisk the Greek yogurt, milk, lemon juice, lemon zest, honey and vanilla for 1 minute, until smooth.
- Combine: pour the mixture evenly into the jars (about 220 ml per jar) and stir for 30 seconds, scraping the bottom, until no dry oats remain.
- Add the berries: fold half the blueberries (100 g in total) through the jars, then scatter the remaining blueberries on top.
- Chill: seal the jars and refrigerate for 8 hours, until the oats are soft and thick.
- Loosen: in the morning, stir each jar and add 1 to 2 tbsp milk if the oats feel too stiff.
- Serve: top with fresh blueberries, lemon zest and extra honey, and eat cold.
Nutrition Facts
Servings 4
- Amount Per Serving
- Calories 370kcal
- % Daily Value *
- Total Fat 9g14%
- Saturated Fat 2.5g13%
- Cholesterol 10mg4%
- Sodium 90mg4%
- Potassium 460mg14%
- Total Carbohydrate 55g19%
- Dietary Fiber 9g36%
- Sugars 20g
- Protein 17g34%
- Vitamin A 20 mcg
- Calcium 290 mg
- Iron 2.6 mg
- Vitamin D 1 mcg
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.
Note
- Use rolled oats; instant oats turn mushy and steel-cut oats stay hard without cooking.
- Add the lemon juice to the yogurt mixture and whisk well so the yogurt stays smooth.
- For a vegan version, use unsweetened soy or coconut yogurt, plant milk and 4 tbsp maple syrup in place of the honey.
- Nutrition values are estimates based on standard ingredient data, using low-fat Greek yogurt and 2% milk, without toppings, and will vary with brands.
