Cook the brown rice penne in a pot of boiling salted water according to package directions until al dente.
While pasta cooks, season the diced chicken breast with sea salt and black pepper.
Heat a non-stick skillet over medium-high heat and sear the chicken until golden and cooked through, then remove from the pan.
In the same skillet, add the sliced mushrooms and minced shallot, sautéing until the mushrooms are browned and tender.
Stir in the minced garlic and cook for 30 seconds until fragrant, then pour in the chicken bone broth to deglaze the pan.
Reduce heat to low, stir in the Greek yogurt and truffle oil until a smooth, silky sauce forms.
Add the cooked pasta and chicken back into the skillet, tossing well to coat every piece in the truffle sauce.
Garnish with fresh parsley and grated parmesan cheese before serving warm.