Pulse the chickpeas, garlic, parsley, cumin, coriander, and half of the salt and pepper in a food processor until a coarse paste forms.
Shape the chickpea mixture into small, firm patties and set aside.
Season the chicken breast with the remaining salt and pepper.
Heat the olive oil in a large skillet over medium-high heat.
Cook the chicken for 5-6 minutes per side until golden brown and cooked through, then remove from the pan and slice into strips.
In the same skillet, sear the falafel patties for 3-4 minutes per side until they develop a satisfyingly crispy exterior.
Whisk together the Greek yogurt, tahini, and lemon juice in a small bowl until smooth.
Place the fresh spinach on a plate, top with the sliced chicken and crispy falafel, and finish with the lemon-tahini drizzle.