Start by boiling 1.5 cups of water and pour it over the dried black beans and your choice of nuts or seeds in a bowl. Allow them to soak for 30 minutes.

While your beans and nuts are soaking, preheat your oven to 350°F (180°C). Line two baking sheets with parchment paper.

In a powerful blender, combine the soaked black beans, nuts or seeds, and 1.5 cups of fresh water. Blend until smooth, then add the baking powder and optional salt.

Pour the smooth batter onto the prepared baking sheets, spreading it evenly about 1/4 inch thick.

Place the baking sheets in the oven and bake for 15 minutes.

Remove the baking sheets from the oven and slice the baked mixture into desired shapes while warm.

Lower the oven temperature to 325°F (160°C) and continue baking for an additional 25-30 minutes.

Allow the chips to cool completely on a wire rack before breaking them into pieces.