Rinse the canned chickpeas thoroughly and pat them very dry with a paper towel to ensure maximum crispiness.
Place the chickpeas, hemp hearts, parsley, cilantro, garlic, cumin, coriander, salt, and pepper into a food processor.
Pulse the mixture until it is well combined and holds together when pinched, but still retains a slightly coarse texture.
Scoop the mixture and form into 4 evenly sized patties, pressing firmly so they do not crumble.
Place the patties in an air fryer basket and cook at 375°F for 12 to 15 minutes, flipping halfway through, until the exterior is golden and firm.
While the falafel cooks, whisk together the Greek yogurt, tahini, and lemon juice in a small bowl until the sauce is smooth and creamy.
Arrange the fresh spinach on a plate, top with the warm falafel patties, and finish with a generous drizzle of the lemon-tahini sauce.