Season the chicken breast with half of the sea salt and black pepper, then sear in a pan with olive oil over medium heat until fully cooked.
Remove the chicken from the pan, let it rest, and then shred it into bite-sized pieces.
In the same pan, add the diced yellow onion and sliced cremini mushrooms, sautéing until the mushrooms are golden brown and tender.
Stir in the minced garlic and arborio rice, toasting the grains for about one minute until they become slightly translucent at the edges.
Begin adding the chicken bone broth half a cup at a time, stirring frequently and allowing the liquid to be fully absorbed before adding the next portion.
Once the rice is creamy and tender, stir in the shredded chicken, parmesan cheese, and Greek yogurt until well combined.
Season with the remaining salt and pepper, garnish with fresh thyme, and serve immediately.