Preheat your oven to 350°F (180°C) and grease a donut pan with cooking spray or coconut oil.

In a large mixing bowl, combine mashed bananas, maple syrup or honey, oil or water, and vanilla extract. Whisk until smooth.

In another bowl, combine flour, baking powder, and salt. Whisk until evenly mixed.

Fold the dry ingredients into the banana mixture until just combined.

Spoon the batter into the prepared donut pan, filling each cavity two-thirds full.

Bake for approximately 8 minutes or until a toothpick comes out clean.

Allow the donuts to cool in the pan for 5 minutes before transferring them to a wire cooling rack.

Frost or glaze the donuts if desired.