Three ingredients. No oven. No flour, no refined sugar, no eggs, no dairy, no butter, no oil. It sounds like a list of restrictions so long that nothing good could possibly come of it — and yet these brownie cookies land somewhere between a fudgy chocolate truffle and a chewy cocoa biscuit, with a texture that sticks to your teeth in the most satisfying way. They come together in under 15 minutes, start to finish, and the kitchen stays cool while you make them — a real mercy as autumn settles into shorter days and you want something sweet without the fuss of a full bake.
The secret sits in the combination of ripe bananas, rolled oats and cocoa powder, each pulling its weight. The banana acts as binder, sweetener and moisture source all at once. The oats give body and chew, while unsweetened cocoa brings that deep, almost bitter chocolate punch that keeps these from tipping into cloying territory. What you get is a cookie that genuinely tastes like a brownie — dense, dark, a little fudgy in the centre — without any of the usual suspects. Worth clearing a bit of bench space for.
| Preparation | 10 min |
| Cooking | 0 min |
| Resting | 30 min (fridge) |
| Portions | 12 cookies |
| Difficulty | Easy |
| Cost | $ |
| Season | Year-round (bananas ripen quickly in autumn warmth) |
Suitable for: Vegan · Dairy-free · Egg-free · Refined sugar-free · Oil-free
Ingredients
- 2 large ripe bananas (about 220 g peeled weight — skins should be well spotted, almost brown)
- 150 g rolled oats (use certified gluten-free oats if required)
- 30 g unsweetened cocoa powder (Dutch-process gives a darker, mellower result; natural cocoa works but tastes sharper)
Utensils
- Large mixing bowl
- Fork or potato masher
- Baking tray or plate lined with baking paper
- Measuring scales or cups
Preparation
1. Mash the bananas until smooth
Peel both bananas into a large bowl. Using a fork or potato masher, crush them thoroughly until you have a smooth, almost purée-like consistency with no large lumps remaining. The riper the banana, the easier this step — and the sweeter your cookies will be without adding any sugar. A few small flecks of banana are fine; they will soften as the cookies set. You are looking for something close to the texture of thick yoghurt. This mashed banana is doing the work of eggs, butter and sugar combined, so take an extra 30 seconds to get it properly smooth.
2. Combine oats and cocoa
Add the rolled oats and cocoa powder directly into the bowl with the mashed banana. Stir firmly with the fork until everything is evenly incorporated. The mixture will look dark and thick, almost like brownie batter — that is exactly right. Scrape down the sides of the bowl as you go. If the dough feels slightly too wet and loose to shape, let it sit for two to three minutes; the oats will absorb moisture from the banana and the mixture will firm up noticeably. If it feels too dry or crumbly, your bananas may have been on the smaller side — add a teaspoon of water or plant milk and mix again.
3. Shape the cookies
Line a tray or large plate with baking paper. Scoop roughly one heaped tablespoon of mixture per cookie and drop it onto the paper. Using damp fingers or the back of a spoon, press each mound into a flat disc about 1 cm thick. They will not spread or rise — there is no leavening agent — so the shape you press is the shape you keep. Space them a centimetre or so apart. You should get around twelve cookies, depending on how generous your scoops are. Wetting your fingers between cookies stops the dough from sticking.
4. Set in the fridge
Transfer the tray to the refrigerator and leave the cookies to firm for at least 30 minutes. During this time, the oats continue absorbing moisture and the cocoa flavour deepens as the mixture chills. After half an hour, the cookies will hold together when lifted and have a satisfying fudgy chew. For an even firmer, more biscuit-like texture, leave them for a full hour or overnight. They peel cleanly off the baking paper once set.
My chef's tip
The ripeness of your bananas makes or breaks these cookies. Look for bananas with heavily spotted or fully brown skins — the kind most people would throw away. At that stage, the starches have almost entirely converted to natural sugars, giving you genuine sweetness without any added sweetener. If you want to push the chocolate flavour further, stir a pinch of instant espresso powder into the cocoa before mixing. It will not make the cookies taste of coffee, but it amplifies cocoa the way salt amplifies everything else. A tiny pinch of flaky sea salt pressed onto the top of each cookie before chilling does wonders too.
Beverage pairings
These cookies sit in a rich, bittersweet register — dark cocoa tempered by banana's mellow sweetness. The pairing should either echo that warmth or cut through it with something bright.
A strong flat white or a short black is the natural match, the espresso bitterness layering onto the cocoa. For something cold, a glass of oat milk (keeping the theme going) shaken with ice works well on a warm autumn afternoon. If you want something more indulgent, try them alongside a mug of homemade hot chocolate made with coconut milk — the fat rounds out the fudginess beautifully. For children, a cold glass of banana smoothie creates a fun echo of flavours.
More about these cookies
No-bake cookies have roots that stretch back to wartime and depression-era kitchens, when fuel for ovens was scarce or rationed and cooks relied on icebox techniques to firm up sweets. The combination of oats and mashed fruit as a binder has been a staple of whole-food and plant-based baking for decades, but the stripped-back three-ingredient format gained real traction through online recipe communities in the mid-2010s, where home cooks competed to see how few ingredients could still produce something worth eating.
The brownie cookie — sometimes called a "brookies" cousin — bridges the gap between a dense, fudgy brownie and a portable, hand-held biscuit. This version leans heavily on the brownie side: soft in the middle, dark, intensely chocolatey. In Australia, where health-conscious snacking and plant-based eating have grown steadily, recipes like this fit neatly into the lunchbox rotation or the after-dinner-something-small slot. They also freeze remarkably well, making them a useful batch-prep staple for the weeks ahead.
Nutritional values (per cookie, approximate values)
| Nutrient | Amount |
|---|---|
| Calories | ~65 kcal |
| Protein | ~2 g |
| Carbohydrates | ~12 g |
| of which sugars | ~4 g |
| Fat | ~1 g |
| Fibre | ~2 g |
Frequently asked questions
Can these be prepared ahead of time?
They keep well in an airtight container in the fridge for up to five days, and they actually improve after the first night as the oats fully soften and the cocoa flavour intensifies. You can also freeze them in a single layer on a tray, then transfer to a freezer bag once solid. They defrost in about fifteen minutes at room temperature or can be eaten straight from the freezer for an almost ice-cream-like texture.
Can I use quick oats instead of rolled oats?
You can, but the texture will change. Quick oats absorb moisture faster and break down more, giving you a softer, almost cake-like cookie rather than one with visible oat texture and chew. If you prefer a smoother result, quick oats are a fine swap. For extra texture in the other direction, try using a mix of rolled oats and a tablespoon of desiccated coconut.
These are not sweet enough for my taste — what can I add?
The sweetness depends almost entirely on your bananas. If they are not ripe enough, the cookies will taste more like oat-cocoa patties than brownies. For extra sweetness without refined sugar, try mixing in a tablespoon of maple syrup, a few chopped medjool dates, or a handful of dark chocolate chips (look for dairy-free if needed). A drizzle of peanut butter or almond butter stirred through the dough also adds richness and a touch of sweetness.
Do these actually taste like brownies?
They will not fool someone expecting a butter-and-sugar bakery brownie. What they do deliver is that dense, fudgy, intensely cocoa-forward quality that makes a brownie a brownie — the chewiness, the dark colour, the slight bitterness balanced by sweetness. Eaten cold from the fridge, the resemblance is strongest. Think of them as the healthiest possible version of a brownie that still genuinely satisfies a chocolate craving.
Can I add mix-ins?
This is where the recipe really opens up. Fold in a handful of walnuts or pecans for crunch, stir through a tablespoon of peanut butter for richness, scatter the tops with flaky sea salt or cacao nibs before chilling, or press a few dark chocolate chips into each cookie. Dried cranberries, shredded coconut and a pinch of cinnamon all work well too. Keep mix-ins to about two tablespoons total so the dough still holds together.