Bring a large pot of salted water to a boil and cook the chickpea linguine according to package instructions until al dente, reserving 1/4 cup of the cooking water before draining.
While the pasta cooks, heat the olive oil in a large skillet over medium-high heat.
Season the chicken breast with half of the sea salt and black pepper, then sear in the skillet until golden and cooked through, about 5 to 7 minutes per side.
Remove the chicken from the skillet, let it rest for a few minutes, then slice it into thin strips.
In the same skillet, add the sliced cremini mushrooms and sauté until they have released their moisture and turned a deep golden brown.
Add the minced garlic to the mushrooms and cook for 30 seconds until fragrant, being careful not to burn it.
Lower the heat and add the cooked linguine, sliced chicken, and the reserved pasta water to the skillet, tossing everything together to coat.
Drizzle the truffle oil over the pasta and sprinkle with the parmesan cheese and the remaining salt and pepper.
Garnish with freshly chopped parsley and serve immediately while the aroma is at its peak.