Drain and rinse the chickpeas, then pat them thoroughly dry with a paper towel to ensure a crispy texture.
In a food processor, combine the chickpeas, hemp seeds, egg white, parsley, cumin, garlic powder, sea salt, and black pepper.
Pulse the mixture until just combined but still slightly coarse; avoid over-processing into a smooth paste.
Form the mixture into four equal-sized patties, pressing firmly so they hold their shape.
Heat a non-stick skillet over medium heat and lightly coat with a high-heat cooking spray.
Place the patties in the skillet and sear for 4 to 5 minutes per side until they are golden brown and firm.
While the falafel cooks, whisk together the Greek yogurt, tahini, and lemon juice in a small bowl until the drizzle is smooth.
Place the fresh spinach on a plate, top with the warm falafel patties, and finish with the lemon-tahini drizzle.