Bring a pot of salted water to a boil and cook the chickpea pasta according to package directions, reserving 0.25 cup of pasta water before draining.
While the pasta cooks, heat the olive oil in a large skillet over medium-high heat.
Season the cubed chicken breast with sea salt and black pepper, then add to the skillet and cook until golden and cooked through.
Add the sliced mushrooms and minced garlic to the skillet, sautéing until the mushrooms are tender and fragrant.
Stir in the baby spinach and cook just until wilted, then remove the skillet from the heat to prevent the yogurt from curdling.
In a small bowl, whisk together the Greek yogurt, truffle oil, and reserved pasta water until smooth and creamy.
Toss the cooked pasta into the skillet with the chicken and vegetables, then pour the truffle sauce over the top and stir until every noodle is evenly coated.