Place the cooked chickpeas, hemp hearts, parsley, garlic, cumin, sea salt, and black pepper into a food processor.
Pulse the mixture until it forms a coarse, slightly sticky paste, being careful not to over-process into hummus.
Divide the mixture and shape into 4-5 small, flat patties with your hands.
Heat the olive oil in a non-stick skillet over medium-high heat.
Place the patties in the pan and sear for 3 to 4 minutes per side until they are golden brown and crispy.
In a small bowl, whisk together the Greek yogurt, tahini, and lemon juice until the sauce is smooth and creamy.
Arrange the fresh spinach on a plate, top with the warm falafel patties, and finish with a generous drizzle of the lemon-tahini sauce.