Preheat oven to 400°.
In a large mixing bowl, add the chickpea flour, water, salt, nutritional yeast, onion powder and rosemary (or green onions).
Whisk together until everything is combined.
Pour the mixture onto a 9x13 inch (32.5x23cm) baking dish.
Bake for 18 minutes.
Take out of the oven and cut immediately. You can cut it into however many pieces you like.
Let cool for a few minutes and then transfer the pieces to a plate and continue to cool for 5-10 minutes.
Serve as a snack, a tapa, an appetizer, or cut it up and place on top of a big green salad.