Drain and rinse the chickpeas, then pat them very dry with a paper towel.
In a food processor, pulse the chickpeas until they are broken down into small crumbles but not yet a paste.
In a medium bowl, combine the pulsed chickpeas, ground turkey, chopped parsley, cumin, garlic powder, sea salt, and black pepper.
Mix the ingredients thoroughly and form into 4 evenly sized small patties.
Heat the avocado oil in a non-stick skillet over medium heat.
Place the patties in the skillet and cook for 5-6 minutes per side until the exterior is golden-brown and the turkey is fully cooked through.
While the falafel cooks, whisk together the tahini, Greek yogurt, and lemon juice in a small bowl until smooth.
Slice the cucumber into rounds and arrange them on a plate.
Place the hot falafel patties over the cucumbers and drizzle with the lemon-tahini sauce before serving.