Drain and rinse the chickpeas, then pat them completely dry with a paper towel to ensure a crispy texture.
In a food processor, pulse the chickpeas, hemp hearts, egg whites, parsley, cilantro, garlic, cumin, salt, and pepper until a coarse, moldable paste forms.
Scoop the mixture and form into 4 to 5 small patties, pressing firmly so they hold their shape.
Heat a non-stick skillet over medium heat and sear the patties for 4-5 minutes per side until golden brown and firm.
In a small bowl, whisk together the Greek yogurt, tahini, and lemon juice until smooth and creamy.
Arrange the mixed greens on a plate, top with the warm falafel patties, and finish with a generous drizzle of the lemon-tahini sauce.