In the bowl of a stand mixer fitted with the paddle attachment or in a large bowl with an electric hand mixer, beat the butter and sugars on medium speed until light and fluffy, about 3-5 minutes.
3/4 cup salted butter, 1/2 cup lightly packed light brown sugar, 1 cup granulated sugar
Add the eggs and vanilla and mix until well combined, then mix in the mashed bananas.
2 large eggs, 1 1/2 teaspoons vanilla extract, 2 very ripe bananas
In a medium bowl, whisk together the flour, baking powder, and baking soda. With the mixer on low, slowly add the dry ingredients to the butter mixer until just combined.
Fold in the chocolate chips until well distributed. Cover and chill in the refrigerator for 30 minutes.
1 1/2 cups semi-sweet chocolate chips
While the dough chills, preheat the oven to 350℉. Line baking sheets with parchment paper.
Use a spoon or a medium (1.5 tablespoon) cookie scoop to portion the chilled dough onto the prepared baking sheets. Bake for 13 minutes, or until the edges are golden brown.
Allow the cookies to cool on the pans for 3-5 minutes before transferring to a wire rack to finish cooling.
Notes
Ingredients
You can use dark brown sugar for a richer flavor if preferred.
Make sure your bananas are very ripe for the best flavor. Ripe bananas are also much easier to mash.
Semi-sweet chocolate chips can be swapped for your favorite baking chips, such as dark chocolate chips or even peanut butter chips.
Tips and tricks
These cookies have a soft, cakey texture. Because of this, the cookie dough is a bit wet, almost more like a batter. Do not skip chilling the dough; this is going to make it easier to scoop and allow the cookies to hold their shape as they bake.
Because the dough is a bit sticky, even after chilling, I find it easiest to scoop the dough with one spoon and use another spoon to push the dough onto the baking sheet.
I have successfully baked these cookies on an unlined baking sheet, but lining your pan first will ensure the cookies don't stick.
Storage
These cookies are best stored in an airtight container at room temperature for up to 5 days.
You can reheat one or two cookies in the microwave for 15 seconds to warm them up a little bit.