Banana Chocolate Chip Cookie Bars (Print Version)

# Ingredients:

→ Cookie Bar Base

01 - ¾ cup unsalted butter, for browning
02 - 1¼ cups packed brown sugar
03 - ¼ cup granulated sugar
04 - ½ cup mashed ripe banana (about 1 large banana)
05 - 2 large eggs, room temperature
06 - 1 teaspoon vanilla extract
07 - 2½ cups all-purpose flour, spooned and leveled
08 - 2 teaspoons ground cinnamon
09 - 1 teaspoon baking soda

→ Mix-ins & Toppings

10 - ½ cup semi-sweet chocolate chips, plus extra for topping
11 - ½ cup milk chocolate chips, plus extra for topping
12 - ⅓ cup toffee bits, plus extra for topping

# Instructions:

01 - Cut butter into cubes and place in a heavy saucepan over medium heat. Stir constantly as the butter melts and begins to foam. Continue stirring until the butter turns golden brown and develops a nutty aroma. Immediately remove from heat and transfer to a heat-safe bowl to cool.
02 - While the brown butter cools, sift together the flour, cinnamon, and baking soda in a medium bowl.
03 - Preheat oven to 350°F (175°C). Line a 9×9 inch baking pan with parchment paper, leaving extra paper hanging over the sides to create handles for easy removal. Lightly spray with non-stick cooking spray.
04 - In a large bowl, combine the cooled brown butter, mashed banana, brown sugar, granulated sugar, eggs, and vanilla extract. Whisk until well combined and smooth.
05 - Add the sifted dry ingredients to the wet ingredients. Fold together gently with a spatula until just combined, being careful not to overmix.
06 - Gently fold in the semi-sweet chocolate chips, milk chocolate chips, and toffee bits until evenly distributed throughout the dough.
07 - Spread the cookie dough evenly into the prepared baking pan, smoothing the top with a spatula.
08 - Sprinkle additional chocolate chips and toffee bits over the top of the dough, gently pressing them in slightly.
09 - Bake for 30-35 minutes, until the top is golden brown and the center is mostly set but still slightly soft. The edges will be more firm than the center.
10 - While the bars are still warm (but not hot), sprinkle more chocolate chips and toffee bits on top, allowing them to soften slightly from the residual heat.
11 - Allow the cookie bars to cool completely in the pan. This is important for the bars to set properly and achieve the right texture.
12 - Once completely cooled, use the parchment paper handles to lift the bars out of the pan. Cut into 9 equal squares and serve.

# Notes:

01 - This cookie dough must be baked immediately after mixing and cannot be stored for later use.
02 - The bars will look slightly underdone when removed from the oven but will continue to set as they cool.
03 - For the best flavor, use very ripe bananas with lots of brown spots.
04 - Brown butter adds a nutty, caramel-like flavor that complements the banana and chocolate perfectly.