Preheat your oven to 400°F and line a baking sheet with parchment paper.
Place the chickpeas, hemp hearts, egg, parsley, cilantro, garlic, cumin, coriander, salt, and pepper into a food processor.
Pulse the mixture until it forms a coarse meal that holds together when pressed, being careful not to over-process into a paste.
Scoop the mixture and form into 6 to 8 small patties, then place them on the prepared baking sheet.
Bake for 20-25 minutes, flipping halfway through, until the falafel are crisp and golden brown on both sides.
While the falafel bake, whisk together the Greek yogurt, tahini, and lemon juice in a small bowl until the sauce is smooth and creamy.
Arrange the fresh baby spinach on a plate, top with the warm falafel, and drizzle the zesty lemon tahini sauce over the top before serving.