Overnight-Oats Jars (Batch of 5)
Five jars built in one calm sitting on a Sunday, so every weekday morning is already done for you — no cooking, no thinking, just lift a lid. Rolled oats, protein, milk, chia and fruit, layered and left overnight to go soft and creamy. Each jar lands at 420 calories and a real 32g of protein. This is the breakfast I make when I want the first decision of my day to already be made.
Prep 01 / Five jars
There was a stretch a few years back where my mornings were a small war. Up before the sun, gym keys in one hand, gym bag in the other, and the only breakfast I could manage was whatever I could grab on the way out the door — which usually meant nothing, and then a sad pastry at half-nine that did me no favours at all. I’d spent twenty years learning how to feed my body and I was still skipping the first meal of the day because I’d run out of time to think. That bothered me more than I’d like to admit.
So one Sunday I sat down at my bench with five empty jars and decided I’d never have that fight again. Fifteen minutes later they were full — oats, a scoop of protein, milk, a spoon of chia, a handful of berries — and into the fridge they went. Monday morning I reached past the chaos, grabbed a cold jar and a spoon, and ate breakfast in the car like a man who had his life together. By Friday I was hooked. No pan, no stove, no early-morning maths. Just a soft, creamy, ready jar with 32 grams of protein already in it.
That’s all this is, love. One quiet Sunday assembly that hands you five real breakfasts. I make a batch most weeks now, and I’ve talked half my gym into doing the same — people who swore they “just weren’t breakfast people,” who turned out to be people who’d never had breakfast made easy. Grab one on the way out and eat it cold, or warm it if you’d rather. Either way the morning’s already sorted. I’ve got you on this one.
01Who it’s for & when to eat it
This is built for the person whose mornings move too fast for cooking but who still wants a real, protein-packed breakfast in their hand. Assemble five jars once, eat all week, no decisions before coffee. Here’s how I steer the jars depending on what you’re chasing.
Thin it down
Drop the oats to a smaller scoop and lean on extra Greek yoghurt or skyr for the protein. You keep all 32g and the jar still sets thick and satisfying, but the calories slide toward 330. More volume from the dairy, fewer calories from the oats — easy on a cut.
Build the jar up
Same protein base, a spoon of peanut or almond butter stirred through and half a sliced banana on top of each jar. Clean, calorie-dense fuel that clears 580+ per jar without you having to choke down extra food at the bench.
Steady morning fuel
The standard jar is a calm way to open the day — slow oats, a real hit of protein, a little fruit. It keeps you full through a busy morning and sits well before or after a session without spiking and crashing you.
Timing: I eat mine first thing, but a jar is just as good mid-morning at your desk or after an early training session — the oats and protein settle the appetite for hours. Grab one cold on the way out or give it a minute in the microwave if you like it warm.
02Ingredients
Makes the full batch — 5 jars, each at 32g protein and about 420 calories. The amounts below are the whole batch, so just divide everything evenly across your five jars. Want fewer or more? Keep the proportions and scale the lot up or down.
Per jar ~32g protein · adjust on the live recipe card- Rolled oats250 g · 2¾ cups
- Whey or plant protein powder, vanilla150 g · 5 scoops
- Greek yoghurt or skyr, plain300 g · 1¼ cups
- Milk (dairy or unsweetened soy)750 ml · 3 cups
- Chia seeds50 g · ⅓ cup
- Mixed berries, fresh or frozen300 g · 10.6 oz
- Banana, sliced optional1 medium
- Vanilla extract1 tsp · 5 ml
- Ground cinnamon1 tsp
- Pinch of saltto taste
- Honey or maple optionalto taste (go light)
Swaps I actually use: no protein powder? Lean harder on the yoghurt or skyr and add a spoon of cottage cheese blended smooth — the jar still clears 30g. For dairy-free, swap the milk for unsweetened soy (it has the protein cows’ milk does), the yoghurt for a soy-based one, and a plant protein. Any fruit works in place of the berries — chopped apple, peach, grated pear. And if your oats turn out thicker than you like, just pour in a splash more milk in the morning and stir.
03Step by step
Five jars, one clear bench
Line up five clean jars with lids — anything around 350–400ml works, a wide mouth makes eating easier. Clear a stretch of bench and have everything to hand. This is a no-cook assembly, so there’s no oven, no pan, nothing to time. Just measuring and layering.
Magnus says: matching jars make even portions easy on the eye. Pick five the same and life gets simpler.
Mix the oats, protein and chia
In one big bowl, stir together the rolled oats, protein powder, chia seeds, cinnamon and a pinch of salt. Mixing the powder in dry first is the trick — it stops the protein clumping later. Give it a proper stir so it’s all one even, sandy mix.
Magnus says: dry-mix the protein every time. Powder dumped onto liquid goes lumpy, and nobody wants a gritty jar.
Pour in the milk and yoghurt
Add the milk, the yoghurt or skyr, the vanilla and a light drizzle of honey if you’re using it. Stir it all into the dry mix until you’ve got one smooth, loose porridge — it’ll look thin now, but the oats and chia drink it up overnight and set it thick. Taste it and adjust the sweetness.
Split it evenly across the 5 jars
Spoon the mixture into your five jars — about a heaped cup in each, filling them roughly the same. Even jars mean even macros, so each one lands near 32g of protein and 420 calories. A quick tap on the bench settles the mix and knocks out air pockets.
Magnus says: if you want it exact, set the jars on a kitchen scale and split to the same weight. I rarely bother, but the option’s there.
Add the fruit, lids on
Share the berries across the tops, and the banana too if you’re going for the bulk version (banana’s best added the morning of, mind — it browns). Press the fruit down lightly or leave it sitting pretty on top, whichever you like. Lids on, firm.
Into the fridge, leave them be
All five jars into the fridge and leave them at least eight hours — overnight is ideal. That’s where the magic happens: the oats soften, the chia swells, and a thin porridge turns into a thick, creamy, spoonable jar. By morning the first one’s ready, and the other four are waiting for the rest of your week.
Magnus says: give it the full overnight if you can. A jar eaten too soon is fine but a touch loose — patience pays off here.
04The spec sheet
Real numbers, calculated — not guessed. The batch makes 5 jars, each about 300g of food. Here’s what one jar and a flat 100g actually give you. Oats carry the carbs and a good wedge of fibre, the protein and dairy do the rest.
| Nutrient | Per jar | Per 100g |
|---|---|---|
| Energy | 420 kcal | 140 kcal |
| Protein | 32.0 g | 10.7 g |
| Carbohydrate | 52.0 g | 17.3 g |
| — of which sugars | 16.0 g | 5.3 g |
| Fat | 9.0 g | 3.0 g |
| — of which saturates | 2.4 g | 0.8 g |
| Fibre | 8.0 g | 2.7 g |
| Sodium | ~0.18 g | ~0.06 g |
Modest for a breakfast that keeps you full all morning. The chia and oats swell with liquid, so you get a big, creamy jar for a fair calorie count — the kind of full that lasts whether you’re holding or losing.
A lifter’s metric. Strong for a grain-based breakfast — most cereal mornings barely hit half this. The protein powder and dairy do the heavy lifting so the oats can bring the slow carbs and fibre.
- Calcium~360 mg · 28% DV
- Phosphorus~430 mg · 34% DV
- Magnesium~120 mg · 29% DV
- Manganese~2.1 mg · 91% DV
- Riboflavin (B2)~0.5 mg · 38% DV
- Vitamin B12~1.1 µg · 46% DV
Macros are calculated from standard food-composition data and will shift a little with your exact ingredients and brands — protein powders especially vary jar to jar. Micronutrient figures are estimates against general adult Daily Values. Numbers are for guidance, not medical advice — see our Nutrition Disclaimer.
05Bulk / Cut / TRT variations
One assembly, three jobs. The protein base stays the same — you move the oats and the fat around it. Macros below are per jar, adjusted for each goal.
The lean default
Drop the oats to a smaller scoop and add an extra spoon of yoghurt or skyr to keep the jar thick. You hold all 32g of protein and the jar still sets creamy, but the calories pull right down. This is how I run it when the scale needs to move and I still want a full breakfast.
Build it up
Same protein, with a spoon of peanut or almond butter stirred through and half a sliced banana on top. Clean, calorie-dense morning fuel that goes down easy at the bench — no choking down extra food when you’re not hungry yet.
Steady & balanced
The standard jar, just as it’s written. Slow oats, a real hit of protein, a little fruit and healthy fat from the chia. Full, steady morning energy without a sugar spike and the slump that follows it.
06Meal prep & storage
This whole recipe is a prep, so storage is the main event — and oats jars are about the friendliest prep there is. Sealed in the fridge, they only get better for the first day or two as everything softens and settles. Make all five on Sunday and your weekday breakfasts are done.
Sealed, the jars hold beautifully for four to five days — perfect for a Sunday batch that carries you through Friday. Keep fresh fruit toppings for the morning-of if you want them at their best.
You can freeze them — leave a little headroom in the jar, freeze without fresh fruit, and thaw a jar overnight in the fridge. The texture softens a touch but it’s still a good, ready breakfast.
Eat it cold straight from the fridge, or warm it 60–90 seconds in the microwave if you like it like porridge. Stir in a splash of milk if it’s set thicker than you fancy. Either way, breakfast is done.
One small thing, because I’d be a poor cook not to say it: trust the overnight set and don’t over-fill the jars. Leave a thumb’s width at the top so there’s room to stir and to add a splash of milk in the morning. A jar that’s packed to the lid is a jar you can’t fix once it’s set.
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07Common questions
Can I use protein powder, or do I need the yoghurt? +
Either gets you there — I use both because they work together. The powder gives you a clean, big bump of protein, the yoghurt or skyr brings creaminess and a bit more. If you’d rather skip the powder, just lean harder on the yoghurt or skyr and maybe a spoon of blended cottage cheese; the jar will still clear 30g of protein, it’ll just be a touch lower in calories and thicker in texture.
Do overnight oats get gluey or slimy? +
Not if you build them right. Use rolled oats, not instant or steel-cut — rolled is the sweet spot for this. Keep the liquid generous so they stay creamy rather than pasty, and don’t over-fill the jar. The chia thickens things naturally, which some people read as “slimy” the first time. If it’s not for you, halve the chia and add a splash more milk in the morning.
How do I make them dairy-free? +
Swap the milk for unsweetened soy milk — it carries roughly the protein cows’ milk does, which matters here — the yoghurt for a soy-based one, and use a plant protein powder you like the taste of. The rest of the recipe stays exactly the same, and so do the macros, give or take. Oat or almond milk works for the texture but adds less protein, so bump the powder a little to make up the gap.
Do I have to eat them cold? +
Not at all. Cold straight from the fridge is how I usually have mine — it’s grab-and-go, no faff. But if you like it warm, give the jar 60–90 seconds in the microwave with the lid off and a stir halfway. It turns into a lovely warm protein porridge. Add a splash of milk first if it’s set on the thick side.
How far ahead can I assemble the whole batch? +
The full five jars are good for four to five days sealed in the fridge, so a Sunday assembly easily covers a working week. If you want them at their freshest, hold off on fresh fruit toppings until the morning you eat each one. Want longer than a week? Freeze a couple without the fruit and thaw them overnight when you’re ready.
Can I lower the sugar? +
Easily. Skip the honey or maple entirely — a vanilla protein powder plus a little cinnamon usually carries the sweetness on its own. Most of the sugar in the jar is the natural kind from the fruit and milk, which comes with fibre and protein alongside it, so it behaves very differently from a spoon of sugar on its own. If you want it lower still, use fewer berries or a tarter fruit.
This prep is the backbone of a full week of meals.
These jars are the breakfast engine of my meal plans — seven days of high-protein meals with the macros counted and the grocery list written. You pick the goal; I do the maths and the cooking order.
See the meal plans →08Pairs well with
Magnus Olafsson
I’m Magnus — twenty years under the iron, from a cold gym in Stockholm to the classic-physique stage, and now mostly in my kitchen in a pink apron. I’ve cut for shows, bulked through winters, and I’ve been on TRT since I was thirty-five. I know what it takes to eat for the body you’re chasing, and I know it shouldn’t come with a side of shame.
Everything here is food I actually cook and macros I actually count. I don’t diagnose, I don’t promise, and I never make a number up. I just feed you well and tell you the truth.
Slim Diet Era shares recipes and general nutrition information. It is not medical or dietetic advice, and we do not provide guidance on obtaining or using any controlled substance. See our Medical Disclaimer and Nutrition Disclaimer.