Place the cooked chickpeas, ground chicken, fresh parsley, minced garlic, cumin, sea salt, and black pepper into a food processor.
Pulse the mixture until the ingredients are well incorporated but still retain some texture; do not over-process into a paste.
Divide the mixture and form into 4 or 5 small, even patties.
Heat the avocado oil in a large non-stick skillet over medium heat.
Add the patties to the skillet and sear for 4 to 5 minutes per side until they are golden brown and cooked through.
While the falafel cooks, whisk together the tahini, lemon juice, and water in a small bowl until the sauce is smooth and pourable.
Arrange the baby spinach and diced cucumber on a plate.
Place the crispy falafel patties on top of the greens and finish by drizzling the lemon-tahini sauce over the entire dish.