Rinse and drain the chickpeas thoroughly, then pat them dry with a paper towel to ensure a crispy texture.
In a food processor, combine the chickpeas, liquid egg whites, nutritional yeast, garlic powder, ground cumin, sea salt, black pepper, and fresh parsley.
Pulse the mixture until well combined but still slightly textured; avoid over-processing into a smooth paste.
Form the mixture into 4 to 5 small patties, pressing firmly so they hold their shape.
Heat the extra virgin olive oil in a non-stick skillet over medium heat.
Place the patties in the skillet and cook for 4-5 minutes per side until they develop a golden-brown, crispy crust.
While the falafel cooks, whisk together the nonfat Greek yogurt, tahini, and lemon juice in a small bowl until smooth.
Arrange the fresh spinach on a plate and place the warm falafel patties on top.
Drizzle the lemon-tahini sauce generously over the falafel and serve immediately.