Preheat the oven to 350 F. Using a stand mixer fitted with a paddle attachment or a hand mixer, add in room temperature butter, brown sugar sweetener, and the granulated sweetener into a mixing bowl. Mix on medium speed until light and fluffy. Scraping down the bowl occasionally with a rubber spatula.
Next, add in the eggs one at a time, beating after each addition. Add in the vanilla extract. Mix until combined.
Add in the banana flour, kosher salt, and baking powder. Mix on medium-low speed for at least one minute.
Add in the chocolate chips and mix until just combined.
Line a rimmed baking sheet with parchment paper. Using a one-ounce cookie scoop, place six scoops of dough evenly onto the baking sheet. Pick up each scoop and roll it into a ball. Flatten each cookie slightly with the palm of your hand.
Bake for 12 minutes or until the cookies are set and golden brown on the bottom. Allow them to cool for a couple of minutes on the baking sheet before removing them to a cooling rack. Keep cookies stored in an airtight container once cooled.