Bring a pot of salted water to a boil and cook the chickpea pasta according to package directions, reserving 2 tablespoons of the starchy pasta water before draining.
Season the chicken breast with half of the sea salt and black pepper.
Heat avocado oil in a large skillet over medium-high heat and sear the chicken until golden and cooked through, then remove from the pan and slice into strips.
In the same skillet, add the sliced cremini mushrooms and minced shallots, sautéing until the mushrooms are browned and tender.
Add the minced garlic to the skillet and cook for 30 seconds until fragrant.
Reduce the heat to low, then stir in the Greek yogurt, truffle oil, reserved pasta water, and the remaining salt and pepper to create a smooth, creamy sauce.
Return the chicken to the pan along with the cooked pasta, tossing everything together until well-coated and heated through.
Garnish with fresh parsley and serve immediately.