01 - Preheat oven to 350°F (175°C). Line an 8x8-inch baking pan with parchment paper.
02 - In a large bowl, mash the avocado until smooth. Add melted coconut oil, honey or maple syrup, egg, and vanilla extract. Whisk until fully combined.
03 - In a separate bowl, mix together oats, almond flour, ground flaxseed, baking soda, and salt.
04 - Add the dry ingredients to the wet ingredients. Stir until just combined.
05 - Fold in dark chocolate chips and walnuts (if using).
06 - Spread the mixture evenly into the prepared baking pan.
07 - Bake for 22–25 minutes, or until the edges are golden and a toothpick inserted in the center comes out clean.
08 - Allow to cool completely in the pan, then lift out and eut into 12 bars.