Walnut Banana Bars

These Walnut Banana Bars are soft, chewy, and warmly spiced with cinnamon, and they come together in one bowl with no mixer! Rolled oats give them a heartier, more substantial texture than a standard cakey banana bar, sitting somewhere between a baked oatmeal and a cookie bar. Ripe banana and coconut sugar sweeten the batter naturally, while dark chocolate chips and chopped walnuts fold in to create a richly flavored, textural bite that holds together beautifully!

An optional brown butter step adds a nutty, toasty depth that takes the flavor noticeably further, and the recipe works equally well with plain melted butter if time does not allow for it!

What are Walnut Banana Bars?

Walnut Banana Bars are baked bars made with mashed ripe banana, rolled oats, gluten free flour, coconut sugar, chocolate chips, and chopped walnuts. They bake in a square pan and slice into portable, chewy bars that sit between a cookie bar and a baked oatmeal in texture. No frosting is needed. The chocolate chips provide richness and sweetness throughout, and the walnuts add crunch in every bite.

Recipe at a glance

Prep time	10 minutes
Bake time	24 to 27 minutes
Cooling time	At least 4 hours
Yield	16 bars
Pan	8-inch square pan
Diet	Gluten free, easily nut free

Ingredients

• 5 tbsp unsalted butter, browned or melted
• 1 cup coconut sugar, or light brown sugar
• 1 ¼ cups ripe mashed bananas
• 1 tsp vanilla extract
• 1 ½ cups gluten free rolled oats, see note
• ⅔ cup gluten free flour, see note
• 1 tsp baking soda
• ½ tsp sea salt
• ½ tsp cinnamon
• 1 cup dark chocolate chips
• ⅓ cup chopped walnuts

What Each Ingredient Does

Brown butter or melted butter

Plain melted butter works perfectly here. Browning it first adds nutty, toasty depth that pairs well with banana, cinnamon, and coconut sugar. Cook over medium heat until golden, then scrape every bit of the brown sediment from the skillet into the batter.

Coconut sugar and ripe bananas

Coconut sugar sweetens these bars with a natural caramel undertone that complements banana and cinnamon better than plain white sugar. Light brown sugar works as a direct 1:1 substitute. Use bananas with visible brown spots — as they ripen, starch converts to sugar, adding more natural sweetness, moisture, and binding to hold the bars together without eggs.

Gluten free rolled oats

One and a half cups of rolled oats makes these bars distinctly different from a standard banana bar. Oats add chew, body, and heartiness that flour alone cannot provide. They also absorb banana moisture during the cool-down period, which is why the full 4-hour cooling time matters. Regular rolled oats work at the same amount for those who are not gluten free.

Gluten free flour, chocolate chips, and walnuts

Two-thirds cup of flour holds the oat-heavy batter together. All-purpose flour substitutes directly. The chocolate chips melt during baking into gooey pockets of chocolate, providing richness without any frosting. Walnuts add crunchy contrast. Omit them entirely for a nut-free version without changing anything else.

How to make Walnut Banana Bars

First, preheat your oven to 350 degrees Fahrenheit. Line an 8 inch square pan with parchment paper.

In a large mixing bowl, combine the browned (or melted) butter and coconut sugar. Stir together.

Then, add in the mashed bananas and vanilla. Stir together.

Mix in the oats, gluten free flour, baking soda, sea salt, and cinnamon. Stir to combine.

Fold in the chocolate chips and walnuts. Stir together.

Pour this mixture into the lined pan. Spread into an even layer.

Bake for 24 to 27 minutes, or until a toothpick inserted comes out with only a few moist crumbs.

Finally, cool for art least 4 hours before slicing and serving.

Why These Bars Need 4 Hours to Cool

Rolled oats absorb moisture as they cool, which is what transforms the soft, slightly sticky bar that comes out of the oven into a firm, sliceable one. The banana also continues releasing its natural sugars and setting into the batter during the cooling period.

Together, these processes take about 4 hours at room temperature. Refrigerating for the last 1 to 2 hours speeds up the process and produces cleaner slices. Rushing this step results in bars that fall apart at the edges and feel gummy in the center.

Why Rolled Oats Change Everything

Most banana bar recipes use only flour, producing a soft, cakey crumb similar to banana bread. Adding rolled oats fundamentally changes the texture. Oats bring natural chew, a slightly nutty flavor, and a heartier bite that makes each bar feel more substantial and satisfying — something that works as a snack or breakfast, not just a dessert.

Tips for the Best Result

Use the ripest bananas possible

Brown-spotted bananas produce the most flavorful and naturally sweet bars. The riper the banana, the more starch has converted to sugar and the more moisture it contributes.

Do not skip the cooling time

Four hours is the minimum. The bars firm up as the oats absorb the banana moisture, and cutting early produces crumbly, underset results. Refrigerating for the last hour or two is the fastest path to clean slices.

Use certified gluten free oats

Regular oats are naturally gluten free but often processed with wheat. For those with celiac disease, certified gluten free oats are the safer choice.

Omit walnuts for a nut-free version

Leave the walnuts out entirely without changing anything else. This makes the recipe suitable for school lunchboxes and nut-free households.

Substitutions

Original	Substitute	Notes
Gluten free rolled oats	Regular rolled oats	Works if not GF. Same amount.
Gluten free flour	All-purpose flour (same amount)	Direct swap
Coconut sugar	Light brown sugar (1:1)	Similar caramel note
Chopped walnuts	Chopped pecans	Slightly sweeter, same crunch
Chopped walnuts	Omit entirely	Makes recipe nut free
Dark chocolate chips	Semi-sweet chocolate chips	Slightly sweeter result
Melted butter	Refined coconut oil (same amount)	Dairy free option

Storage

Room temperature: Store in an airtight container for up to 3 days.

Refrigerator: Refrigerate for up to 5 days for a firmer texture and cleaner slices.

Freezer: Wrap individually and freeze for up to 2 months. Thaw at room temperature for 30 minutes.

Frequently Asked Questions

You May Also Like

• Banana Bread Pudding
• Brownie Banana Bread
• Cheesecake Banana Bread
• Almond Flour Oatmeal Cookies
• Chocolate Crunch Cake

If you make this Walnut Banana Bars recipe, I would really appreciate a review! You can find me on Instagram, Facebook, and Pinterest. Join my exclusive Facebook Group for a behind the scenes look. I would love for you to follow along! For more ideas, check out these Dessert Recipes.