These Peanut Butter Overnight Oats are a creamy, high-protein and high-fiber breakfast that tastes like a peanut butter cookie in a jar. They’re great for meal prep!

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creamy peanut butter overnight oats topped with peanut butter and berries

Reasons You’ll Love This Recipe:

Peanut butter for breakfast! Creamy, a little salty-sweet, and tastes way more like a treat than a balanced breakfast has any right to. If peanut butter is your love language, this is your jar.
High Protein: between the Greek yogurt, protein powder, and peanut butter, these overnight oats pack nearly 40 grams of protein per serving!
High in Fiber: loaded with fiber-rich ingredients like oats, chia seeds, and flax seeds, plus a little extra from the peanut butter. There are about 9 grams of fiber per serving!
Great for Meal Prep: a few minutes of stirring tonight means breakfast is done tomorrow — and the next few days, too, because this recipe is easy to double, triple, or quadruple.

Ingredient Notes & Substitutions:

For a full ingredient list with quantities, please check out the recipe card at the bottom of this post.

ingredients to make peanut butter overnight oats

Oats: Use old-fashioned oats.
Greek Yogurt: plain Greek yogurt adds protein, creaminess, and a little tang. You can also use a no added sugar vanilla Greek yogurt if you prefer your oats a little sweeter, or if your protein powder isn’t very sweet.
Chia & Flax Seeds: these seeds add fiber, healthy fats, and help create the perfect overnight oats consistency.
Milk: use whichever milk you prefer to drink. I love using an ultra-filtered milk for another boost of protein.
Protein Powder: vanilla is the perfect partner for peanut butter here. A peanut butter-flavored protein powder works beautifully too if you want to double down. Or go with chocolate for the classic chocolate peanut butter variation.
Peanut Butter: the star! A natural, drippy-style creamy peanut butter stirs in the easiest, but any creamy peanut butter will work.

How to Make Peanut Butter Overnight Oats

For complete instructions, please check out the recipe card at the bottom of this post.

ingredients in a jar to make peanut butter protein overnight oats

Add all ingredients to a jar or bowl and stir to combine (make sure there are no chia seed clumps, and that the peanut butter is fully stirred in!).
Cover the container and place in the fridge overnight, or at least 4 hours.
Before serving, give the oats a stir. The oats will absorb much of the liquid, and different protein powders can affect absorption, too, so add an extra splash of milk if needed.

Tips and Variations

Use Drippy Peanut Butter: natural-style peanut butter (the kind you stir) blends into the oats the easiest. If your peanut butter is thick, microwave it for 10–15 seconds first so it stirs in smoothly instead of staying in one stubborn blob. Or just stir a few extra times!
Gluten-Free: as long as your protein powder has no gluten-containing additives, you’re good! Grab certified gluten-free oats if you need them.
Dairy-Free: use a plant-based protein powder and milk, and your favorite dairy alternative Greek-style yogurt.
No Added Sugar: use an unsweetened Greek yogurt, a protein powder with no added sugar, and a peanut butter with just peanuts (and maybe salt) on the ingredient list.
PB&J Overnight Oats: stir in a spoonful of your favorite jam, smash fresh berries right on top, or top with a spoonful of my raspberry chia jam.
Chocolate Peanut Butter: swap in chocolate protein powder or stir in a teaspoon of cocoa powder. My kids also say adding a sprinkle of mini chocolate chips is a solid move, too.
PB Banana: add half a sliced banana on top in the morning.
Do a Double Stir: because this mixture makes a thicker overnight oats with the Greek yogurt, protein powder, and peanut butter, you shouldn’t experience oats or seeds settling at the bottom. But if you do, wait 5 minutes after stirring, then stir once more before refrigerating.

How to Make Without Protein Powder:

You have two great options! First, powdered peanut butter (like PB2) is a sneaky-good protein powder stand-in here — use 2 tablespoons in place of the protein powder scoop, and you’ll boost both the protein and the peanut butter flavor. Second, you can simply skip the powder, add an extra teaspoon or two of peanut butter, and stir in your preferred sweetener of choice (maple syrup and honey both love peanut butter), since some of the sweetness in this recipe comes from the protein powder.

FAQs

My oats are too thick/ thin, what do I do?

Change the texture by changing the amount of liquid. I like my oats on the thicker side as a personal preference, but also because it’s easier to adjust the consistency when they’re starting out thicker. Just add a little extra milk in the morning before eating, if your oats are too thick for your liking!

Also note that different protein powders can affect the absorption differently, and peanut butter thickens things up too — so you may need a splash more milk than you’d expect.

What’s the best peanut butter for overnight oats?

A creamy, natural-style peanut butter (ingredients: peanuts, maybe salt) stirs in the most smoothly and keeps the recipe’s added sugar low. That said, the best peanut butter is the one already in your pantry — crunchy works too and adds a fun texture, and conventional creamy peanut butters absolutely get the job done.

Do you eat overnight oats warm or cold?

Overnight oats are typically eaten cold, but you can enjoy them warm, too. Heat your overnight oats (remove any metal lids!) for 30-60 seconds, then stir. Continue adding 10-15 seconds at a time, then stirring, until your overnight oats reach your desired temperature. (Warm pb overnight oats taste like a gooey peanut butter cookie, btw.)

Are overnight oats safe to eat since you’re not cooking the oats?

Yes. You may hear concern over the phytic acid in oats, as it’s sometimes called an “anti-nutrient,” since phytic acid can slightly inhibit the absorption of some nutrients (iron, zinc, and calcium). But this effect is mostly limited to what you’re eating at that current meal.

Additionally, research has shown us that phytic acid is rarely a concern if you’re eating enough and an overall balanced diet.

Check out more info in this article, “Are Overnight Oats Healthy?”

Meal Prep + Storage

Stored in an airtight jar in the fridge, they stay good for 3-4 days. The texture does get thicker as the days go on (the oats and chia keep slowly absorbing liquid), so just stir in a splash of milk before eating if day-three oats are thicker than you like.

To meal prep a few days of breakfasts, simply multiply the recipe by however many jars you want and mix it right in the jars — my 10 ounce glass jars are the perfect single-serving size.

peanut butter overnight oats drizzled with peanut butter and topped with berries

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