Preheat the oven to 450F. Line a large baking sheet with parchment paper (for easier cleanup); place an ovenproof wire rack on top of pan; spray rack with cooking spray (see notes below if you do not have a wire rack; you can do this with the sheet pan alone!).
Cut the eggplant lengthwise into ¼-inch thick slices. Cut slices crosswise into fries lengths.
In a medium bowl, whisk the chickpea flour, warm water, oil, salt and optional herbs/spices until blended and smooth. Place 5 or 6 fries in batter, gently pressing into batter with a fork to coat. Remove fries, one at a time, with a fork, and place on prepared rack. Repeat until al fries are coated.
Bake the fries in the preheated oven for 14 to 17 minutes until golden brown and tender. Serve immediately (with optional marinara if desired).
