Preheat your oven to 350°F (175°C) and line an 8x8-inch baking dish with parchment paper, leaving some overhang for easy removal.
In a large mixing bowl, combine the mashed bananas, almond butter, honey, and vanilla extract. Mix until well combined.
Add the rolled oats, baking soda, cinnamon, and salt to the banana mixture. Stir until everything is evenly incorporated.
If using, fold in the chocolate chips and chopped nuts.
Pour the mixture into the prepared baking dish and spread it evenly.
Bake in the preheated oven for 20-25 minutes, or until the edges are golden brown and a toothpick inserted in the center comes out clean.
Allow the bars to cool in the pan for about 10 minutes, then lift them out using the parchment overhang and let them cool completely on a wire rack before cutting into squares.