Pulse the rinsed chickpeas, parsley, cilantro, and garlic in a food processor until finely minced but not pureed.
In a large mixing bowl, combine the chickpea mixture with the ground chicken, chickpea flour, cumin, coriander, salt, and pepper until well incorporated.
Form the mixture into four small, even patties about half an inch thick.
Heat the avocado oil in a non-stick skillet over medium heat and sear the patties for 4 to 5 minutes per side until golden brown and the chicken is fully cooked.
While the falafel cooks, whisk together the tahini, lemon juice, and water in a small bowl until the drizzle is smooth and creamy.
Dice the cucumber and halve the cherry tomatoes, then arrange them on a plate as a fresh base.
Place the warm falafel patties over the vegetables and finish the dish by drizzling the lemon-tahini sauce over the top.