In a small saucepan over high heat, add the chickpeas, water, garlic, cumin, salt, and pepper. Bring to a boil, then lower the heat and simmer for 15 minutes. Add the tahini and use a potato masher to lightly mash some of the chickpeas while keeping most of them whole. Cover to keep warm until ready to serve.
In a large non-stick skillet over medium heat, add the pine nuts and dry toast for 5 minutes, until golden brown. Set aside in a small bowl.
Add 1 tablespoon olive oil and the pita bread pieces to the same skillet over medium heat. Toast for 8–10 minutes, stirring frequently, until golden brown and crispy. Set aside in a medium bowl.
Lower the heat to medium-low. Add the remaining tablespoon of olive oil to the skillet along with the garlic and salt. Cook until the garlic is fragrant, about 1 minute. Pour the yogurt on top of the garlic and stir gently until the yogurt becomes warm and loosens, being careful not to let the yogurt boil, about 5 minutes.
When ready to serve, transfer the chickpea mixture to a round serving dish and pour the yogurt sauce over the chickpeas. Add the toasted pita on top, followed by the toasted pine nuts, and garnish with parsley. Serve immediately.