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Preheat the oven to 350F
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Generously grease a 9-inch by 13-inch baking dish with butter or coconut oil.
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Large bowl, use a fork to mash the bananas as smoothly as possible.
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Add in the nut butter, eggs, baking soda, salt, vanilla, and cinnamon and stir well, creating a cake-like batter.
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Fold in the dark chocolate chips (optional)
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Pour the batter into the greased baking dish.Use spatula to spread it evenly across the bottom of the pan.
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Bake at 350F, about 30 minutes, until the top is golden and the center is firm.
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Allow the cake to cool in the pan completely before cutting and serving.