How To Make Overnight Oats In A Mason Jar

Not a morning person? Me neither…which is why I love overnight oats so much! All you have to do is put a few ingredients in a mason jar the night before, stick it in the fridge overnight, and in the morning you’ll have a totally delicious, healthy breakfast that’s ready to eat!

You can toss it in your bag on the way out the door and enjoy your breakfast on the go. Or feel free to just eat it at home and congratulate yourself on having a delicious, healthy breakfast that required no cooking or effort whatsoever! Today I’m going to show you how to make overnight oats in a mason jar in under five minutes!

How to make overnight oats in a mason jar

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If you’re making a single serving, a 1 pint mason jar is the perfect size! If you want to triple or quadruple the batch to make enough for the whole family, you can use a half gallon mason jar, or just find a large plastic food container with an airtight lid.

Overnight oats will last about three days in the refrigerator, so you can make a couple of jars all at once if you want! The oats will keep getting softer and softer the longer they’re in the fridge, but I find that after about 3 days it’s just a soggy mess and not really edible anymore.

How To Make Overnight Oats In A Mason Jar

The recipe below will make a super basic single serving of overnight oats. But the sky’s the limit when it comes to customizing your overnight oats so they taste exactly how you want! There are tons of optional add-in ideas below to help you get started. And it’s so easy to double or triple the batch if you want to make enough for the whole family!

Base Recipe

  • ½ C rolled oats (not quick-cook, steel cut, or instant)
  • 1 Tbsp chia seeds
  • ¾ C to 1 C milk

NOTE: I love the chia seeds in this recipe; they soak up a ton of milk and give the whole thing a nice, thick, pudding-like quality. But if you’re not a fan of chia seeds, leave them out and only use a ½ C of milk for the base recipe.


Making overnight oats in a mason jar is SO simple! Just put the oats and chia seeds in a jar and add any fruits, spices, sweeteners, or any other add-ins.

how to make overnight oats in a mason jar

Fill the jar with milk (or mix ¼ C of yogurt with ½ C of milk, then add to the jar for a creamier option).

the easiest overnight oats recipe

Put the lid on the jar and shake it up to get it all mixed up. If there’s extra room at the top of the jar after everything is mixed, add a little more milk to top it off.

healthy breakfast in a mason jar

Put the lid back on the jar and stick in the fridge overnight. When you wake up, the oats and chia seeds will have soaked up all the milk and you’ll have a delicious, nutritious, ready-to-eat breakfast waiting for you!

how to make overnight oats in a mason jar

Add a topping if you wish, then grab a spoon and dig in!

how to make overnight oats in a mason jar

Mix it up with some fun add-ins to customize your overnight oats!

Add fruit:

  • peaches
  • blueberries
  • apples
  • pears
  • strawberries
  • bananas
  • really, any kind of fruit you’d like!

Add a sweetener:

  • sugar
  • agave
  • honey
  • stevia
  • maple syrup
  • cocoa powder
  • brown sugar

Use a different liquid:

  • soy milk
  • almond milk
  • coconut milk
  • rice milk
  • thinned yogurt
  • kefir

Other fun add-ins:

  • protein powder
  • cinnamon
  • peanut butter
  • matcha powder
  • pumpkin


Add these on top of your oats after they have soaked overnight, just before you dig in!

  • chopped nuts
  • granola
  • chopped fruit and berries

how to make overnight oats in a mason jar


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how to make overnight oats in a mason jar

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Jessi Wohlwend

I believe that anyone can do crafts and DIY projects, regardless of skill or experience. I love sharing simple craft ideas, step by step DIY project tutorials, cleaning hacks, and other tips and tricks all with one goal in mind: giving you the tools you need to “do it yourself”, complete fun projects, and make awesome things!

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Reader Interactions

  1. Marrie says

    4 years ago

    Seem ok but how do u eat this. Old or warm? U don’t mention,

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