Pre-heat the oven to 350 F° and prepare an 8x8 inch baking pan or dish with non-stick spray and parchment paper.
In a bowl, stir together the flax meal and water to create a flax "egg" and then set it aside to gel. Meanwhile, in a mixing bowl, stir together the oats, oat flour, almond flour, baking powder and salt. Add in the maple syrup, coconut oil, vanilla and flax egg.
Mix until everything is well combined. Fold in half of the chocolate chips and walnuts. Press the mixture into the prepared pan and top with remaining chocolate chips and coconut. Bake for 15 minutes. Cover with tin foil and continue to bake for an addition 10 minutes.
Once you remove it from the oven, let the bars cool for 15 minutes before cutting into squares and serving.
Bars should be stored at room temperature in a sealed container for up to 4 days or freeze for up to 3 months.