Bring a pot of salted water to a boil and cook the chickpea pasta according to package directions, reserving 0.25 cup of the starchy pasta water before draining.
Dice the chicken breast into bite-sized pieces and season with half of the sea salt and black pepper.
Heat a large non-stick skillet over medium-high heat and sear the chicken until golden brown and cooked through, then remove from the pan and set aside.
In the same skillet, add the sliced mushrooms and cook until they release their moisture and become deeply browned.
Add the minced garlic to the mushrooms and sauté for 30 seconds until fragrant, then return the cooked chicken to the pan and reduce heat to low.
Whisk the Greek yogurt with the reserved pasta water until smooth, then pour the mixture into the skillet, stirring constantly to create a creamy sauce.
Fold in the cooked pasta and drizzle with truffle oil, tossing until every strand is coated.
Garnish with fresh parsley and the remaining salt and pepper before serving immediately.