A small glass jar is filled with overnight oats and topped with graham cracker and lime twists.

There are few things in the world I love more than a perfectly tangy key lime pie! The only way to make it better? Pump all that amazing flavor into a nourishing grab-and-go breakfast in the form of these Key Lime Pie Overnight Oats!

What are overnight oats?

Overnight oats are a no-cook form of oatmeal that you mix together and let sit (surprise!) overnight in the fridge. In the morning, you have a creamy-dreamy grab-and-go breakfast that you can eat cold or warm up. If you want more details on everything overnight oats, check out our big Overnight Oats 101 post.

A spoon with a blue handle sits in a jar of overnight oats. Limes and graham crackers surround the jar.

What makes overnight oats so special?

I think that overnight oats should be a meal prep staple. Here’s why we’ll always have them in our rotation:

  • Overnight oats are super easy to meal prep. Take just a few minutes on the weekend or in the evening to mix up your oats, and breakfast will be ready to grab-and-go. Overnight oats are not only easy to make in advance—they are designed for it!
  • You can customize them to fit your dietary preferences. Make your overnight oats vegan, gluten-free, super nourishing, or super decadent—make them your own! We’re covering key lime pie overnight oatmeal here, but once you get a feel for overnight oats, you can discover your own favorite flavor.
  • Overnight oats are just flat-out delicious! This porridge is thick, hearty, and creamy. Who doesn’t want to feel like they are eating pudding for breakfast?
  • They can be made in bulk. Overnight oats are a staple on many meal prep menus for a reason—you can make an entire week’s worth of breakfast at once. The only limitation is how many jars you have!
  • They can be a healthy (or decadent) way to start the day. You are in full control of your overnight oats, so you can make them as nutrient-dense (try adding super seeds like chia, flax, and hemp) or decadent (try adding some white chocolate) as you’d like.
A hand pours milk into a white bowl of overnight oat ingredients.

Do you eat overnight oats cold or heated up?

Most folks eat overnight oats cold (that’s part of the grab-and-go appeal of them), but if you’re not into that (or it is too cold outside), you can warm them in a small saucepan on the stove. Or, you can heat them in the microwave for 30-60 seconds, stirring frequently.

Can I use regular limes, or do I need to use key limes?

I prefer key limes over regular limes because they are more aromatic, which means that sweet lime flavor can really shine through in these overnight oats. But while key limes are cute and small and fun, they tend to be hard to juice. I recommend either buying bottled key lime juice or using regular limes, for ease.

Can you make substitutions to these key lime pie overnight oats?

One of the best things about overnight oats is that they are super easy to customize! You can make all sorts of tweaks to suit your dietary needs or preferences. Need them to be gluten-free, vegan, or lower in sugar? No problem! We cover all sorts of substitutions you can make in our in-depth overnight oats post, but here are some specific swap ideas for these key lime pie overnight oats:

  • Make it vegan: Use plant-based cream cheese, plant-based yogurt, and maple syrup. Make sure to double-check your graham crackers for animal products.
  • Make it sugar-free: Drop the sweetener, make sure to use unsweetened milk, and add 1/2 mashed ripe banana. Or use stevia or monk fruit sweetener in place of the maple syrup or honey, if you prefer.
  • Make it gluten-free: Make sure to use certified gluten-free oats, and don’t add any graham cracker crumbles (or crumbled up gluten-free graham crackers instead).
A hand holds a spoon with a blue handle. Spoon is full of overnight oats topped with lime twist and graham cracker crumbles.

Where can you find more overnight oats recipes?

We’ve got a whole set of easy overnight oats recipes! Here are some of the most well-loved recipes on Wholefully.

A small glass jar is filled with overnight oats and topped with graham cracker and lime twists.

Key Lime Pie Overnight Oats

Yield: 1 large serving, or 2 small
Prep Time: 5 minutes
Total Time: 5 minutes

Tangy and sweet, these Key Lime Pie Overnight Oats are like eating your favorite pie for breakfast!



  1. Whisk together all ingredients in a medium-sized mixing bowl. Spoon into a pint or half liter jar with a tight-fitting lid.
  2. Close and refrigerate for at least 4 hours, but preferably overnight, before eating.
Nutrition Information:
Yield: 2 Serving Size: 1 half batch
Amount Per Serving: Calories: 340Total Fat: 11gSaturated Fat: 4gTrans Fat: 0gUnsaturated Fat: 5gCholesterol: 22mgSodium: 239mgCarbohydrates: 53gFiber: 4gSugar: 29gProtein: 11g

At Wholefully, we believe that good nutrition is about much more than just the numbers on the nutrition facts panel. Please use the above information as only a small part of what helps you decide what foods are nourishing for you.

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  1. The recipe was good, I definitely would’ve added a bunch more lime zest though. I thought by far that was the best added touch!

    1. Thanks, Rachel! We’re so glad you liked it! Feel free to customize it to your heart’s content. That’s the best part of finding a new recipe you love—making it exactly the way you like it!

  2. Very delicious recipe for overnight oats. Tasted exactly like Key Lime pie. Thank you for sharing a great recipe.

  3. My family had very little money when I was growing up, and I remember hating the oatmeal porridge that we had virtually every day for breakfast. (I was in my fifties before I chose to eat porridge again!) I did, however, like to sneak mouthfuls of raw rolled oats from the tin. This is an excellent option! I’ll have to try it before I decide if I prefer it over my current “pie for breakfast”: multi-grain Cheerios, banana, and custard made with very little sugar.