Place the cooked chickpeas, hemp seeds, egg whites, nutritional yeast, garlic, parsley, cilantro, cumin, coriander, sea salt, and black pepper into a food processor.
Pulse the mixture until the ingredients are well incorporated but still retain a slightly coarse, pebbly texture.
Scoop the mixture and form into four thick patties, pressing firmly with your hands so they hold their shape.
Heat the olive oil in a large non-stick skillet over medium heat until shimmering.
Place the patties in the skillet and cook for 4 to 5 minutes per side until a deep golden-brown crust forms.
In a small bowl, whisk together the Greek yogurt, tahini, and lemon juice until the sauce is smooth and pourable.
Plate the hot falafel patties and finish with a generous drizzle of the lemon-tahini sauce.