In a blender, process, the chickpea flour, water, spinach and salt until blended and completely smooth, stopping to scrape down sides of blender once or twice, as needed.
Transfer batter to a glass measuring cup or pitcher (for easy pouring); cover and let rest for at least 1 hour or for up to 48 hours.
Heat a medium, nonstick skillet (I used seasoned cast iron; a ceramic non-stick pan is another healthy choice) over medium-high heat.
Pour about ⅓ cup batter into the pan, quickly tilting in all directions to cover bottom of pan. Cook for about 45 seconds, until it’s just golden at the edges. With a spatula, carefully lift an edge of the tortilla to test for doneness. The tortilla is ready to turn when it is golden brown on the bottom and can be shaken loose from the pan. Turn the tortilla over and cook for 15 to 30 seconds, until it releases easily from the pan.
Transfer the tortilla to a cooling rack to cool completely. Repeat with the remaining batter, adjusting the heat as necessary between tortillas, stacking the cooled tortillas between sheets of waxed paper to prevent sticking.
