Name: Soft Banana Oat Cookies
Prep time: 15 min
Cook time: 12 min
Total time: 27 min
Ingredients: 3 large (very ripe bananas (about 350g peeled weight)); 80 ml ⅓ cup melted butter, cooled slightly; 100 g ½ cup soft light brown sugar; 1 large egg (at room temperature); 1 teaspoon vanilla extract; 150 g 1½ cups rolled oats (not instant); 130 g 1 cup plain flour; ½ teaspoon bicarbonate of soda; ½ teaspoon ground cinnamon; ¼ teaspoon salt; 80 g ½ cup dark chocolate chips or chopped walnuts (optional)

There are some weekends that simply call for a slow, soothing project in the kitchen, and for me, that often begins with the scent of ripe bananas filling the house. This recipe for Soft Banana Oat Cookies has become my go-to for those lazy afternoons when I want something nourishing, quietly comforting, and just sweet enough to feel like a proper treat. It’s about the gentle rhythm of mashing, stirring, and waiting as the oven does its work, transforming humble ingredients into golden, pillowy rounds.

Recipe Overview

Prep Time: 15 minutes
Cook Time: 12–14 minutes
Total Time: 30 minutes
Servings: 18–20 cookies
Difficulty: Easy

Why You’ll Love This Soft Banana Oat Cookies

They capture the cosy essence of a banana loaf but in a perfectly portioned, soft-baked cookie.
The oats provide a lovely, chewy texture that feels hearty without being heavy.
Only one bowl is needed, which means less washing up and more time to enjoy the quiet.
They are naturally sweetened by the fruit, so you can adjust the added sugar to your liking.
My husband, who’s usually picky, asked for seconds! These have a way of winning over even the toughest critics.

Soft Banana Oat Cookies

15 min prep · 12 min cook · 18 servings

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Ingredients You’ll Need

3 large, very ripe bananas (about 350g peeled weight)
80ml (⅓ cup) melted butter, cooled slightly
100g (½ cup) soft light brown sugar
1 large egg, at room temperature
1 teaspoon vanilla extract
150g (1½ cups) rolled oats (not instant)
130g (1 cup) plain flour
½ teaspoon bicarbonate of soda
½ teaspoon ground cinnamon
¼ teaspoon salt
80g (½ cup) dark chocolate chips or chopped walnuts (optional)

Tip: For the best flavour and sweetness, use bananas that are heavily speckled with brown spots or even entirely black. The softer they are, the more moisture and natural sugar they bring to the dough.

Equipment You’ll Need

Stand mixer or hand mixer (or just a strong arm and a wooden spoon)
Large mixing bowl
Baking tray (one large or two small)
Parchment paper
Wire cooling rack
Fork or potato masher

How to Make Soft Banana Oat Cookies

Ready the oven and tray: Preheat your oven to 180°C (160°C fan) or 350°F. Line a large baking tray with parchment paper. The paper should lie flat and crisp; if it curls, a dab of butter under each corner will hold it still.
Mash the bananas: In your large bowl, mash the bananas with a fork until they form a chunky purée. You want a few small lumps remaining for texture, but no large pieces. The mixture should look almost like a thick, pale custard.
Combine the wet ingredients: Add the melted butter, brown sugar, egg, and vanilla extract to the mashed bananas. Beat with your mixer or a wooden spoon until the mixture is smooth, glossy, and smells deeply of vanilla. It should be a uniform, light caramel colour.
Mix the dry ingredients: In a separate small bowl, stir together the rolled oats, plain flour, bicarbonate of soda, cinnamon, and salt. Make sure the bicarbonate is evenly distributed; you do not want a bitter pocket in a single cookie.
Bring it together: Pour the dry mixture into the wet mixture. Stir gently with a spatula or spoon until just combined. The dough will be quite soft, almost like a thick porridge, and will smell warmly of oats and spice. Fold in the chocolate chips or walnuts if using.
Scoop and shape: Using a tablespoon or a cookie scoop, drop rounded mounds of dough onto the prepared baking tray, spacing them about 5cm apart. They will spread slightly, so leave room for the edges to meet without touching. The tops should look slightly craggy but moist.
Bake until golden: Place the tray in the preheated oven and bake for 12–14 minutes. At 12 minutes, the edges will be set and a deep golden brown, while the centres will still look slightly soft and pale. The kitchen will fill with a sweet, toasty banana and oat aroma.
Cool on the tray: Remove the tray from the oven and let the cookies rest on the hot tray for 5 minutes. This is crucial; they will be too soft to move immediately. After 5 minutes, carefully transfer them to a wire rack to cool completely. The bottoms should be golden and firm, while the tops remain soft.

Tips From My Kitchen

Use room temperature ingredients: A cold egg straight from the fridge can seize the melted butter, making the dough stiff and less cohesive. Let your egg sit out for 20 minutes before you start. This ensures a smooth, emulsified batter that bakes evenly.
Do not overmix the dough: Once you add the flour, stir only until you can no longer see streaks of white. Overworking the dough develops the gluten in the flour, which will make the cookies tough and dense instead of tender and soft.
Trust the visual cues, not just the timer: Ovens vary, so rely on what you see and smell. When the edges are a rich amber and the centre looks just set but still soft, the cookies are done. They will continue to cook from the residual heat of the tray.
Chill the dough if you have time: For cookies with a slightly thicker, chewier centre, pop the scooped dough into the fridge for 20 minutes before baking. This solidifies the butter slightly, slowing the spread and giving a more substantial bite.
Measure your oats correctly: Scoop the oats lightly into your measuring cup, then level off with a knife. Packing them down will give you too many oats, resulting in a dry, crumbly cookie that lacks the intended soft, moist texture.
Add a touch of texture: Friends always ask me for this recipe after trying it at dinner parties, and the secret is often a handful of chopped walnuts or pecans. They add a lovely crunch that contrasts beautifully with the soft, pillowy cookie.

Common Mistakes to Avoid

Overcrowding the pan: Placing the dough mounds too close together causes them to merge into one giant, unevenly baked blob. Leave at least 5cm of space between each cookie so the hot air can circulate, giving them a golden edge all around.
Wrong temperature: Baking at too high a temperature will brown the outsides before the centres have cooked through, leaving a raw, doughy middle. Too low, and they will spread into flat, crispy discs. Stick to 180°C (350°F) for the perfect balance.
Skipping the rest time: The 5-minute rest on the hot tray is not optional. The cookies are incredibly fragile straight from the oven and will fall apart if moved too soon. This resting period allows the structure to set, so they hold their shape when transferred to the rack.

Delicious Variations to Try

Spiced Chai Version: Replace the cinnamon with 1 teaspoon of chai spice blend (cardamom, ginger, cloves, and nutmeg). The warm, aromatic spices pair beautifully with the banana and add a lovely, fragrant complexity.
Vegan Option: Substitute the butter with 80ml of coconut oil (melted) or a neutral vegetable oil. Replace the egg with a flax egg (1 tablespoon ground flaxseed mixed with 3 tablespoons water, left to sit for 5 minutes). The cookies will be slightly less rich but still wonderfully soft.
Different Mix-Ins: Swap the chocolate chips for dried cranberries, chopped dried apricots, or desiccated coconut. A handful of pepitas (pumpkin seeds) also adds a lovely, nutty crunch without being overpowering.

What to Serve With Soft Banana Oat Cookies

A glass of cold milk for a classic, nostalgic pairing.
A warm cup of tea, such as a chai or a light oolong, to complement the spice.
For a more indulgent treat, serve them alongside a scoop of vanilla ice cream or a dollop of thick Greek yogurt. If you are after another light sweet treat, you might also enjoy these Greek Yogurt Brownies For A Light Sweet Treat.
A drizzle of honey or a smear of peanut butter turns these into a more substantial snack. For another fruity option, try these Healthy Peanut Butter Banana Muffins Recipe 2.

Still hungry for ideas? You might also love Banana Bread Cookies Recipe, Crumbl Banana Bread Cookies With Cream Cheese Glaze from our sister kitchens.

Frequently Asked Questions

Can I use instant oats instead of rolled oats?

You can, but the texture will be noticeably different. Instant oats are much finer and more powdery, so they absorb moisture quickly and create a denser, almost cake-like cookie. Rolled oats give a more distinct, chewy texture that holds its shape better.

How do I store these cookies to keep them soft?

Store them in an airtight container at room temperature for up to 3 days. To maintain their softness, place a slice of plain bread in the container with the cookies; the bread will absorb excess moisture and release it back into the cookies, keeping them tender. Change the bread slice every day.

Can I freeze the dough or baked cookies?

Absolutely. To freeze the dough, scoop it into balls, place them on a tray in the freezer until solid, then transfer them to a freezer bag. You can bake them directly from frozen, adding 2–3 minutes to the baking time. Baked cookies also freeze well for up to 2 months; just thaw them at room temperature.

Why did my cookies turn out flat and thin?

This usually happens if the butter was too warm or the dough was not chilled. If your bananas were very large and watery, that extra moisture can also cause spreading. Next time, try chilling the scooped dough for 20 minutes before baking, and ensure your bananas are well-mashed but not overly liquid.

Can I make these cookies gluten-free?

Yes, you can substitute the plain flour with a good-quality 1:1 gluten-free baking blend that contains xanthan gum. The oats must be certified gluten-free as well. The texture will be slightly more delicate, but they will still be soft and delicious. Reduce the baking time by a minute or two to prevent them from drying out.