Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper to prevent sticking.
Drain and rinse the chickpeas thoroughly, then pat them dry with a paper towel to ensure the falafel gets crispy.
In a food processor, combine the chickpeas, egg, hemp hearts, parsley, garlic, red onion, cumin, sea salt, and black pepper.
Pulse the mixture until it forms a coarse, uniform dough that holds together when pressed, being careful not to over-process into a paste.
Scoop the mixture and form into 6 small, even patties, placing them onto the prepared baking sheet.
Bake for 20-25 minutes, flipping the patties halfway through the cooking time, until they are golden-brown and firm to the touch.
While the falafel bakes, whisk together the Greek yogurt, tahini, and lemon juice in a small bowl until the sauce is smooth and zesty.
Arrange the fresh baby spinach on a plate, top with the warm falafel patties, and drizzle generously with the prepared tahini yogurt sauce.