Mason Jar
Overnight Oats

Easy and delicious with simple ingredients, mason jar overnight oats are a healthy breakfast to make ahead and take on the go. When things get busy, or when eating lots of meals out, meal prepping is a lifesaver. I like to make mine in mason jars with delicious layers, but there are so many ways to customize them as you like!

By Frixos Dimitriadis
370MIN TOTAL
21.9gPROTEIN
350KCAL
33.3gCARBS
14.2gFAT
4SERVINGS
Mason Jar Overnight OatseasyDietsync Recipes

The easiest and healthiest breakfast you can meal prep: Mason Jar Overnight Oats

These Peanut butter Jam overnight oats are the quick and easy breakfast that you always wanted. With their peanut buttery taste, these overnight oats are creamy, delicious and so rich in nutrients.

Keep them in the fridge for a quick and healthy breakfast that tastes like dessert!

These healthy overnight oats are rich in protein but have no protein powder! This recipe uses only simple ingredients that you can easily find at your local grocery store.

SUBSTITUTES

Here are all the ingredients and substitutes that you need to make these mason jar overnight oats.

  • Plant-based milk: Usually I use almond milk for my overnight oats, but you can choose any plant-based milk you like such as coconut, soya, rice milk or even dairy milk. If you like it higher in protein, go for soya milk.
  • Rolled oats – For overnight oats I recommend rolled oats as they don't become too soft overnight. But feel free to replace them with quick-cook or instant oats.
  • Peanut butter – replace with the nut butter of your choice (almond butter, cashew butter, walnut butter) or sunflower seed butter for a nut-free recipe.
  • Yoghurt: my favourite yoghurt is Greek, but Skyr or quark are always great options. Also, plant-based would work well.
  • No calorie sweetener: you can use stevia, honey, agave or maple syrup or any other sweetener you like.
  • Chia seeds: you can swap chia seeds with flaxseeds (same quantity).
  • Melted berries: if you prefer instead of melting the frozen berries, use a low-calorie jam of your choice. Raspberry or strawberry jams go pretty well with peanut butter.

TOPPINGS

For toppings, usually use a combo of fresh fruits and nuts/nut butter. But there are so many variations you could try. Some of them are:

- Walnuts and raspberries

- Hazelnuts and trimmed dark chocolate

- Granola 

- Apple and cinnamon 

Variations are endless, experiment a bit each time you make them, so you will never get bored of them.

Ingredients

4
  • Oats
    160 g
  • Peanut butter
    40 g
  • Chia seeds
    20 g
  • Greek yoghurt 0%
    400 g
  • Unsweetened almond milk
    400 ml
  • No-calorie liquid sweetener
    4 tbsp

Toppings

  • Mixed berries
    200 g
  • Walnuts, chopped
    20 g

How to Build It

  1. 1

    Start with Peanut Butter

    Assemble the overnight oats in layers right in the 4 mason jars: put 10 g of peanut butter in the bottom of each jar.

  2. 2

    Mix the Oats

    In a bowl, mix the oats, chia seeds, Greek yoghurt, almond milk and 3 tbsp of the sweetener and stir well, then divide between the jars on top of the peanut butter.

  3. 3

    Make the Berry Layer

    Warm the 200 g of mixed berries with the remaining 1 tbsp of sweetener in a pan or the microwave for 3-4 minutes until jammy, then divide between the 4 jars, spooning some down the sides.

  4. 4

    Chill Overnight

    Put lids on the jars and transfer to the fridge. Refrigerate overnight and for up to five days.

  5. 5

    Top and Enjoy

    When you're ready to eat, pull a jar out of the fridge and top it with 5 g of chopped walnuts. You can stir everything together or eat the layers one at a time.

Pro Tips

✨

The Thickening Secret Don't skip the chia seeds; they act as the thickening agent that creates the signature creamy texture.

🥛

Morning Adjustment If the oats look too thick in the morning, stir in a splash of extra milk right before eating.

🔥

Toasty Flavor Mix For maximum flavor, lightly toast the oats in a dry pan for 2 minutes before mixing with liquids.

Modifications

Adjust this recipe to fit your goal

Target: Adjust macros for calorie deficit goals

  • Swap peanut butter for PB2 powder to save fat calories.
  • Skip the walnuts and double the berries for volume.
  • Use a lower ratio of oats to yogurt.

Frequently asked questions

How long do overnight oats keep?

Up to 5 days in the fridge with the lids on, so one batch covers most of your working week. Add the chopped walnuts just before eating so they stay crunchy.

Do I eat them cold or warm?

They are made to eat cold, straight from the fridge. If you prefer them warm, take off the lid and microwave the jar for 1 to 2 minutes, stirring halfway.

How can I add more protein?

Stir a scoop of protein powder into the oat mixture with a splash more almond milk before you fill the jars. Each jar already has 21.9 g of protein for 350 calories.

Can I make them dairy-free?

Yes. Swap the Greek yoghurt for a soy yoghurt. The texture stays creamy, but the protein per jar drops, so a scoop of plant protein helps make up the difference.

Rate this recipe:

Macro Breakdown

21.9g

Protein

25%

33.3g

Carbs

38%

14.2g

Fat

37%

350kcal
Protein 25% Carbs 38% Fat 37%

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Fits Your Goals If…

Bulking (2800 kcal)
13%
Maintenance (2200 kcal)
16%
Cutting (1700 kcal)
21%
Protein Goal (180g)
12%

Protein Efficiency

6.3g

protein per 100 kcal

Moderate

Average efficiency. Consider adding a protein source.

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