Step 1: Preheat and Prepare Pan : Preheat your oven to 350°F (175°C). Line an 8x8-inch baking dish with parchment paper or lightly grease it.
Step 2: Mix Dry Ingredients : In a large bowl, combine rolled oats, flour, baking powder, salt, and cinnamon. Stir well to evenly distribute everything.
Step 3: Mix Wet Ingredients : In another bowl, mash the ripe bananas until smooth. Add honey (or maple syrup), nut butter, melted coconut oil, and vanilla extract. Whisk together until creamy and well combined.
Step 4: Combine Wet and Dry Mixtures : Pour the wet ingredients into the dry mixture. Stir until everything is evenly moistened — the mixture should be thick and slightly sticky.
Step 5: Add Chocolate Chips and Nuts : Gently fold in chocolate chips and nuts (if using). Reserve a few chocolate chips to sprinkle on top before baking for a pretty finish.
Step 6: Bake the Bars : Spread the batter evenly in the prepared baking dish. Press it down firmly with the back of a spoon or spatula to compact it. Bake for 25–30 minutes, or until the edges are golden and the center is set.
Step 7: Cool and Slice : Allow the bars to cool completely in the pan. Once cool, lift them out using the parchment paper and slice into bars or squares.