Peanut Butter Banana Overnight Oats — Creamy, Naturally Sweet & Effortlessly Cozy

It was a Thursday night, kids finally in bed, and I had exactly 4 minutes before I collapsed on the couch. I peeled two very ripe bananas, grabbed the peanut butter, and threw everything into a jar.

The next morning, my breakfast was waiting for me — cold, creamy, and genuinely good. If you already love our classic banana overnight oats, this peanut butter version is going to be your new Thursday-night ritual.

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Why You’ll Love This Recipe

If you’ve been sleeping on peanut butter overnight oats, this is your sign. Six ingredients, one jar, zero cooking — and the result is somehow better than anything you’d make with actual effort.

• Ready in 5 minutes. Stir, jar, fridge — done. Your future self will thank you.
• Only 6 ingredients. All real, all simple, nothing you need to hunt down.
• Naturally sweet. The ripe bananas do the sweetening — maple syrup is just a nudge if you need it.
• 100% vegan & dairy-free. Any plant milk works beautifully here.
• Hot or cold. Eat it straight from the fridge or warm it up for a cozy porridge vibe — both are good.

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Ingredients & Notes

Six ingredients — that’s really it. No protein powder, no fancy superfood add-ins, no trip to a specialty store. Everything here is already in your kitchen, and every single one of them matters. Here’s what to know before you start.

Ripe bananas. Two medium bananas — the riper the better. Brown spots mean more natural sweetness and a creamier mash. If yours are still yellow, pop them in a 300°F (150°C) oven for 15 minutes to speed things up.

Rolled oats. Use old-fashioned rolled oats — they absorb the liquid overnight and give you that soft, creamy texture. Quick oats will turn mushy. Steel-cut oats won’t soften enough without cooking. For a gluten-free version, check out our fully plant-based overnight oats made with certified GF oats.

Plant milk. Any works — oat milk gives the creamiest result, almond milk keeps it lighter, soy milk adds a little extra protein. Use whatever you love or have on hand.

Peanut butter. Smooth (creamy) for a silky texture, chunky if you want little pockets of crunch. Natural peanut butter works great — just stir it well before measuring. If you need a nut-free version, sunflower seed butter is a solid swap.

Cinnamon. Just a pinch. It rounds out the banana and peanut butter in the most warm, comforting way.

Maple syrup. Taste first — if your bananas are very ripe, you may not need any at all. Add a small drizzle only if you want a little extra sweetness.

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How to Make Peanut Butter Banana Overnight Oats

This is a 5-minute recipe — truly. No blender, no stove, no special equipment. You mash, stir, jar, and sleep. The fridge does the rest. Follow these steps exactly once and you’ll never need to read them again.

1. Mash the bananas. Peel both bananas and place them in a medium bowl or directly into your jar. Mash well with a fork until you get a smooth, lump-free paste. The smoother the mash, the creamier the final texture.

2. Add everything else. Spoon in the peanut butter, pour in the plant milk, and sprinkle in the cinnamon. Stir everything together until fully combined and the mixture looks uniform — no dry pockets of oats, no streaks of peanut butter.

3. Taste and adjust. Dip a spoon and taste. If your bananas were very ripe, you’re done. If you’d like it a little sweeter, add a small drizzle of maple syrup and stir again.

4. Transfer to a jar. Pour the mixture into a mason jar or any airtight container. Seal it shut.

5. Refrigerate overnight. Place the jar in the fridge for at least 6 hours — overnight is ideal. The oats will absorb the liquid and become soft and creamy while you sleep.

The jar, sealed and ready. Leave it overnight and let the magic happen.

6. Serve cold or warm. Pull the jar from the fridge in the morning. Eat it cold — creamy, thick, satisfying. Or microwave for 60–90 seconds to turn it into a warm, melty peanut butter porridge. Both versions are genuinely good.

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Lily’s Tips

I’ve made this jar so many times that I’ve stopped measuring. But when I first started, a few small things made the difference between good and really good. These are the ones worth keeping.

Use the ripest bananas you can find. Brown-spotted bananas contain up to 80% more natural sugar than yellow ones — which means more flavour, more creaminess, and less need for added sweetener. Trust the bananas.

Stir it before you eat it. The oats settle overnight. A quick 10-second stir in the morning brings everything back together and makes the texture perfectly even.

Try the warm version. Most people have no idea you can warm overnight oats. 60 seconds in the microwave transforms the peanut butter into a soft, melting layer through the whole jar. My kids fight over who gets the last bite.

Chunky peanut butter = bonus texture. If you want a little crunch against the soft oats and banana, use chunky-style peanut butter. It adds contrast without any extra work.

“The riper your bananas, the less sugar you’ll need — nature does the sweetening for you.”

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Variations

This base recipe is already really good — but it’s also a blank canvas. Once you’ve made it once, you’ll see how easy it is to take it in a completely different direction with just one or two extra ingredients. Here are my favorites.

Chocolate peanut butter overnight oats. Add 1 tablespoon of unsweetened cocoa powder to the base mixture. Stir well — it turns the whole thing into a rich, chocolatey bowl. For a dedicated chocolate version, this chocolate banana overnight oats recipe is exactly what you need.

Peanut butter powder version. Swap the regular peanut butter for 2 tablespoons of powdered peanut butter (PB2 or similar) mixed with 2 tablespoons of water before adding. Lower in fat, same peanut butter flavour — a good option if you’re watching calories.

Extra protein boost. Stir in 1 scoop of vanilla or unflavored protein powder with the dry ingredients. The banana and peanut butter already bring natural protein, but this takes it further if you’re using this as a post-workout breakfast.

Banana bread overnight oats. Add a pinch of nutmeg, a drop of vanilla extract, and a tablespoon of chopped walnuts. It tastes like banana bread in a jar — or check out our banana bread overnight oats for the full version of that idea.

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How to Store

One of the best things about this recipe is that it was made for meal prep. Make one jar or make four — the effort is almost exactly the same. Here’s everything you need to know to keep them tasting good all week.

Counter: Not recommended — these contain mashed banana and plant milk, which need refrigeration.

Fridge: Up to 3 days in an airtight jar or container. The texture actually improves after day 1 as the oats continue to absorb and soften. Give it a stir before eating and add a splash of plant milk if it’s gotten too thick.

Freezer: Up to 1 month. Portion into individual jars, seal, and freeze. Thaw overnight in the fridge — stir well before eating. Texture may be slightly softer but still creamy and good.

Meal prep tip: Make 3–4 jars on Sunday night and stack them in the fridge. Breakfast is sorted for the whole week. Label each jar with the date — they’re best within 3 days but hold well up to day 3.

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Made This? Here’s What’s Next.

Five minutes the night before. That’s genuinely all this takes — and waking up to a jar of creamy, peanut buttery banana goodness makes the whole morning feel a little softer. I hope it becomes part of your weekly rhythm the way it has mine.

Tag me on Instagram @eatwithmellow or leave a star rating below — I read every single one.

If you love this, try a warm banana oatmeal for those mornings when you want something hot, or browse our peanut butter banana smoothie when you need breakfast in a glass instead.

Love, Lily 🍌