Bring a large pot of salted water to a boil and cook the chickpea pasta according to package directions until al dente, reserving 2 tablespoons of pasta water before draining.
While the pasta cooks, dice the chicken breast into bite-sized pieces and season with a pinch of sea salt and black pepper.
Heat a non-stick skillet over medium-high heat and sear the chicken until golden and cooked through, about 5-6 minutes, then remove from the pan and set aside.
In the same skillet, add the sliced mushrooms and minced shallot, sautéing until the mushrooms have released their moisture and turned golden brown.
Add the minced garlic and baby spinach to the skillet, stirring for 1 minute until the spinach is just wilted.
In a small bowl, whisk together the Greek yogurt, chicken broth, truffle oil, and the remaining sea salt and pepper.
Reduce the skillet heat to low, then return the chicken and cooked pasta to the pan.
Pour the yogurt mixture over the pasta, adding the reserved pasta water if needed to reach a creamy consistency, and toss gently until everything is well coated and heated through.