Drain and rinse the chickpeas, then pat them dry with a paper towel to ensure maximum crispiness.
Press the extra-firm tofu between paper towels to remove excess moisture, then crumble it into small pieces.
Place the chickpeas, crumbled tofu, garlic, parsley, cumin, coriander, salt, and pepper into a food processor and pulse until the mixture is combined but still has some texture.
Transfer the mixture to a bowl and fold in the egg whites until fully incorporated; this acts as a high-protein binder.
Form the mixture into 4-5 small patties.
Heat the olive oil in a non-stick skillet over medium-high heat and sear the patties for 4-5 minutes per side until they are golden-brown and firm.
In a small bowl, whisk together the Greek yogurt, tahini, and lemon juice until smooth to create the zesty sauce.
Serve the warm falafel patties drizzled with the tahini sauce.