In a small pot, bring the chicken bone broth to a low simmer and keep it warm.
Heat olive oil in a wide skillet over medium heat and sauté the diced shallot and minced garlic until translucent and fragrant.
Add the sliced mixed mushrooms and fresh thyme to the skillet, cooking until the mushrooms are browned and tender.
Stir in the dry arborio rice, toasting it for 1-2 minutes until the edges of the grains become translucent.
Add the simmering bone broth one ladle at a time, stirring frequently and allowing the liquid to be fully absorbed before adding the next ladle.
While the rice is simmering, poach or pan-sear the chicken breast until cooked through, then shred it into bite-sized pieces.
Once the rice is creamy and al dente, stir in the shredded chicken, nutritional yeast, sea salt, and black pepper.
Serve the risotto immediately while it is warm and has a velvety consistency.