Preheat oven to 350?F (177?C) and line an 8x8 metal baking pan with parchment paper.

In a large mixing bowl, whisk together the oat flour, cocoa powder, baking soda, cinnamon, and salt.

In a small bowl, thoroughly mash the bananas with a fork. Measure to ensure you have 1 cup of mashed banana. Add the maple syrup, coconut sugar, coffee, vanilla, and almond butter, and stir until smooth.

Pour the wet mixture into the dry and stir until fully combined. Fold in the walnuts.

Transfer batter to the prepared pan and bake for 28 to 31 minutes or until a toothpick inserted in the center comes out clean.

Let the brownies rest in the pan for 20 minutes, then lift out by the parchment paper and allow to cool completely before cutting into 16 squares.