Preheat your oven to 350°F (175°C) and grease an 8x8 inch baking pan.

Squeeze excess moisture from the grated zucchini using a clean dish towel.

In a large mixing bowl, combine oat flour and cocoa powder, then stir in your choice of sweetener.

Add the squeezed zucchini and pumpkin puree to the dry mixture and mix until just combined.

Fold in chocolate chips or nuts gently, being careful not to overmix.

Pour the batter into the prepared pan and bake for 25-30 minutes.

Let the brownies cool in the pan for at least 10 minutes before slicing.