Banana Cookie Bars

These Banana Cookie Bars are chewy at the edges, gooey in the center, and loaded with melted dark chocolate chips in every square. Brown butter and coconut sugar give the batter a deep, caramel-like richness that plain butter and granulated sugar cannot match, and two egg yolks instead of a whole egg produce a chewier, denser texture that feels more like a thick chocolate chip cookie bar than a dense banana bread bar. The whole recipe comes together in one bowl with no mixer, uses gluten free flour natively, and bakes in 25 to 27 minutes.

The gooey middle is intentional and they firm up completely as they cool. These bars are so tasty!

What are Banana Cookie Bars?

Banana Cookie Bars are thick, chewy bars made from a pressed cookie dough with mashed ripe banana, brown butter, coconut sugar, egg yolks, and dark chocolate chips baked in a square pan. They taste like a thick banana chocolate chip cookie in bar form: chewy at the edges, gooey and soft-set in the center, with no frosting or topping needed. The entire batch bakes in one pan and slices into squares once cooled.

Ingredients

• ½ cup mashed ripe bananas
• 2 egg yolks
• 1 stick butter, browned or melted
• 1 cup coconut sugar or light brown sugar
• 1 tsp vanilla extract
• 2 cups gluten free flour, see note
• 1 tsp baking soda
• 1 cup dark chocolate chips

What Each Ingredient Does

Brown butter and coconut sugar

Browning the butter adds nutty, toasty flavor compounds that plain melted butter does not contain. In a bar built on banana and coconut sugar, those compounds create a richer, more caramelized result. Cook over medium heat until golden and toasted-smelling, then cool a few minutes before mixing.

Plain melted butter works as a substitute. Coconut sugar sweetens with a caramel and molasses undertone that pairs beautifully with brown butter, banana, and dark chocolate chips. Light brown sugar substitutes at 1:1.

Egg yolks only

Two egg yolks instead of one whole egg is the key technique behind the chewy texture. Yolks provide richness and fat without the extra water from egg whites.

That higher fat ratio produces a denser, chewier bar with a cookie-like texture rather than a cakey banana bread bar. More yolk, less white, chewier result.

Ripe bananas, dark chocolate chips, and GF flour

Use bananas with visible brown spots. The riper the banana, the more intensely banana-flavored and naturally sweet the finished bars will taste. One cup of dark chocolate chips folds in for gooey, melted pockets of chocolate in every square.

High-quality dark chips make a noticeable difference in a recipe with so few ingredients. Two cups of a 1:1 GF baking blend provides enough structure to hold the bars together while keeping the chewy texture. All-purpose flour substitutes at the same amount.

How to Make Banana Cookie Bars, Step-by-Step

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

In a large mixing bowl, add the ripe bananas, egg yolks, browned butter, coconut sugar, and vanilla. Stir together.

Then, add in the flour and baking soda. Stir to combine.

Fold in the dark chocolate chips. Press this mixture into the lined pan.

Bake for 25 to 27 minutes, or until a toothpick inserted comes out with moist crumbs.

Lastly, allow the bars to cool before slicing and serving.

Why egg yolks make these bars chewier

Whole eggs contain both a fat-rich yolk and a water-rich white. That water content creates steam during baking, which contributes to lift and a cakey, open crumb. Using only yolks removes that steam source. The higher fat-to-water ratio keeps the bars dense and chewy rather than cake-y and light.

The same technique produces the chewiest chocolate chip cookies: more yolk, less white. For a banana bar that tastes like a thick, chewy cookie rather than a slice of banana bread, egg yolks are the key ingredient swap.

Tips for the Best Result

Use very ripe bananas

Brown-spotted bananas provide the most natural sweetness and intense flavor. An underripe banana produces flat-tasting bars.

Cool the brown butter before mixing

Hot brown butter can partially cook the egg yolks. Allow it to cool for at least 5 minutes before adding to the bowl.

Press the dough firmly into all four corners

The dough is thick and will not spread on its own. An uneven layer bakes unevenly. Press all the way to the edges before baking.

Pull the bars when the center still looks gooey

Moist crumbs on the toothpick at 25 minutes is the correct signal. Baking until a clean toothpick produces dry, cakey bars that lose the chewy texture.

Use high-quality dark chocolate chips

With so few ingredients, chip quality shows clearly. A good dark chip produces a noticeably richer, more satisfying bar.

Substitutions

Original	Substitute	Notes
Gluten free flour	All-purpose flour (same amount)	Direct swap
Coconut sugar	Light brown sugar (1:1)	Similar caramel depth, slightly less complex
Brown butter	Plain melted butter	Less complex flavor, still delicious
Dark chocolate chips	Semi-sweet or dairy-free chips	Slightly sweeter or makes bars dairy free
Salted butter	Unsalted butter + small pinch of salt	Same result

Storage

Room temperature: Store in an airtight container for up to 3 days. The bars stay chewy at room temperature.

Freezer: Wrap individual bars tightly and freeze for up to 3 months. Thaw at room temperature for 20 to 30 minutes before eating.

Frequently Asked Questions

You May Also Like

• Sugar Cookie Bars
• Magic Cookie Bars
• Cookie Dough Cheesecake Bars
• Brown Butter Chocolate Chip Cookie Bars
• Paleo Samoa Bars

If you make this Banana Cookie 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.