Place the chickpeas, egg whites, hemp hearts, nutritional yeast, parsley, cilantro, garlic, onion, cumin, coriander, salt, and pepper into a food processor.
Pulse the mixture until well combined but still slightly textured, ensuring it is not a complete puree.
Form the mixture into 4 or 5 small, even patties using your hands.
Heat the avocado oil in a large non-stick skillet over medium heat.
Add the patties to the skillet and sear for 3 to 4 minutes per side until they are golden brown and crispy.
In a small mixing bowl, whisk together the Greek yogurt, tahini, and lemon juice until the sauce is smooth.
Arrange the fresh baby spinach on a plate, top with the warm falafel patties, and drizzle generously with the lemon-tahini sauce.