Bring a large pot of water to a boil and cook the chickpea pasta according to package instructions until al dente.
Reserve 2 tablespoons of the starchy pasta water before draining the pasta and setting it aside.
Season the diced chicken with sea salt and black pepper, then sauté in a large skillet over medium-high heat until cooked through.
Remove the chicken from the pan and add the sliced mushrooms and minced garlic, cooking until the mushrooms are tender.
Add the fresh spinach to the skillet and stir until just wilted.
In a small bowl, whisk together the Greek yogurt, reserved pasta water, and truffle oil to create a smooth sauce.
Return the chicken to the skillet, add the cooked pasta, and pour the truffle sauce over the mixture.
Toss everything together over low heat until the sauce is creamy and evenly distributed.
Serve the pasta warm, topped with a light dusting of grated parmesan cheese.