Bring a large pot of salted water to a boil and cook the red lentil pasta according to package directions until al dente.
While the pasta cooks, slice the chicken breast into thin strips and season with a pinch of salt and pepper.
Heat a non-stick skillet over medium-high heat and sauté the chicken until golden and cooked through, then remove from the pan and set aside.
In the same skillet, add the sliced cremini mushrooms and diced shallot, sautéing until the mushrooms release their moisture and turn a deep brown.
Add the minced garlic and cook for 30 seconds until fragrant, then pour in the vegetable broth to deglaze the pan.
Stir in the nutritional yeast to create a light, creamy consistency in the pan juices.
Add the cooked pasta and chicken back into the skillet, tossing well to coat everything in the sauce.
Remove from heat and drizzle with the truffle oil, then garnish with fresh chopped parsley and remaining black pepper before serving.