Chewy Banana Oatmeal Cookies

The smell of overripe bananas sitting on my counter always triggers a quiet debate in my kitchen: banana bread or banana cookies. One rainy Tuesday afternoon, cookies won, and I threw together oats, mashed bananas, and whatever else the pantry offered. What came out of the oven was a soft, chewy cookie with a golden edge that made me question why I ever bothered with banana bread. These chewy banana oatmeal cookies have been a staple in my rotation ever since.

My neighbor stopped by unannounced one weekend while a batch was cooling on the rack. She ate three standing right there in the doorway, still wearing her raincoat, and asked if I had a coffee to go with them. That spontaneous little moment turned into a standing Saturday arrangement.

Ingredients

• 2 ripe bananas, mashed: The browner the peel, the sweeter and more intense the banana flavor becomes in the dough.
• 115 g (1/2 cup) unsalted butter, softened: Softened butter creams properly with sugar, creating the light texture these cookies need.
• 100 g (1/2 cup) brown sugar, packed: Brown sugar adds moisture and a subtle caramel note that pairs beautifully with banana.
• 50 g (1/4 cup) granulated sugar: A touch of white sugar helps the edges crisp slightly while the centers stay soft.
• 1 large egg: Binds everything together and contributes to that classic chewy cookie crumb.
• 1 tsp vanilla extract: Rounds out the banana flavor and adds warmth to every bite.
• 160 g (1 1/4 cups) all-purpose flour: Provides structure without making the cookies cakey or dense.
• 1/2 tsp baking soda: Gives just enough lift so the cookies spread evenly without puffing up too much.
• 1/2 tsp ground cinnamon: A quiet spice that makes the banana and oat combination sing together.
• 1/2 tsp salt: Balances the sweetness and enhances every flavor in the dough.
• 180 g (2 cups) old-fashioned rolled oats: These are the heart of the cookie, delivering that irresistible hearty chew.
• 90 g (1/2 cup) chocolate chips or chopped walnuts (optional): Either choice transforms the cookie into something a little more indulgent and special.

Instructions

Preheat and prepare:

Set your oven to 175 degrees C (350 degrees F) and line two baking sheets with parchment paper so nothing sticks.

Cream the butter and sugars:

Beat the softened butter, brown sugar, and granulated sugar together until the mixture looks pale, fluffy, and irresistible.

Add the wet ingredients:

Mix in the mashed bananas, egg, and vanilla extract until everything is smoothly combined and smells like a tropical bakery.

Whisk the dry ingredients:

In a separate bowl, whisk together the flour, baking soda, cinnamon, and salt so the leavening and spice are evenly distributed.

Combine wet and dry:

Gradually stir the dry mixture into the wet, mixing just until no streaks of flour remain and being careful not to overwork the dough.

Fold in the oats:

Gently fold in the rolled oats and any chocolate chips or walnuts, distributing them evenly throughout the soft dough.

Scoop and shape:

Drop tablespoon-sized mounds onto the prepared baking sheets, leaving about 5 cm of space between each one so they have room to spread.

Bake until golden:

Bake for 10 to 12 minutes, watching for golden edges and centers that look just set but still a little soft.

Cool properly:

Let the cookies rest on the baking sheet for 5 minutes before moving them to a wire rack to cool completely and finish setting.

Save

I packed a tin of these cookies for a long road trip once and they survived three states, a few bumpy back roads, and one very eager passenger who kept sneaking them from the back seat.

How to Store Them

Keep these cookies in an airtight container at room temperature and they stay beautifully soft for up to four days. If you somehow have leftovers beyond that, a quick ten-second warm in the microwave brings back that fresh-from-the-oven tenderness.

Making Them Gluten Free

Swapping the flour for a certified gluten-free blend and using gluten-free rolled oats works wonderfully here. The texture changes slightly, becoming a bit more delicate, but the banana and oat flavors hold everything together beautifully.

Fun Ways to Customize

This dough is a willing canvas for whatever you have tucked in your pantry. Half the fun is experimenting with mix-ins and seasonal twists.

• Try adding a pinch of nutmeg for a warm, cozy depth that complements the banana.
• Swap chocolate chips for raisins if you want something that leans more toward a breakfast cookie.
• Always taste a bit of the dough before baking to check if the sweetness level matches your preference.

Save

These cookies are proof that the simplest recipes often leave the biggest impression. Bake a batch, share them freely, and watch them disappear faster than those bananas ever did on your counter.

Recipe FAQs

→ How ripe should the bananas be for these cookies?

Use fully ripe bananas with plenty of brown spots on the peel. The softer and sweeter the bananas, the more moisture and natural sweetness they add to the dough, resulting in a chewier texture and richer banana flavor.

→ Can I use quick oats instead of old-fashioned rolled oats?

Old-fashioned rolled oats provide the best chewy texture and structure. Quick oats absorb moisture faster and can make the cookies softer and less hearty. If quick oats are all you have, reduce the amount slightly by about ¼ cup to maintain a similar consistency.

→ Why did my cookies spread too much during baking?

Over-creaming the butter and sugar or using bananas that are overly ripe and watery can cause excessive spreading. Try chilling the dough for 30 minutes before scooping onto baking sheets. Also ensure your oven is fully preheated to 175°C (350°F) before baking.

→ How should I store leftover banana oatmeal cookies?

Store cooled cookies in an airtight container at room temperature for up to 4 days. Place a sheet of parchment paper between layers to prevent sticking. You can also freeze them in a sealed freezer bag for up to 3 months—just thaw at room temperature when ready to enjoy.

→ Can I make these cookies gluten-free?

Yes, substitute the all-purpose flour with a certified gluten-free flour blend and use certified gluten-free rolled oats. Check all labels carefully, as cross-contamination can occur in processing facilities. The texture may be slightly different but still delicious.

→ What add-ins work well in banana oatmeal cookies?

Chocolate chips and chopped walnuts are classic choices, but raisins, dried cranberries, shredded coconut, pecans, or even a handful of toffee bits work beautifully. Add about ½ cup of any combination without overwhelming the banana and oat base.