Heat the chicken broth in a small saucepan over low heat to keep it warm throughout the cooking process.
Sauté the diced chicken breast in olive oil over medium heat until golden and cooked through, then remove from the pan and set aside.
In the same pan, add the diced onions and sliced mushrooms, cooking until the vegetables are soft and the mushrooms have released their moisture.
Stir in the minced garlic and arborio rice, toasting the grains for one minute until the edges become slightly translucent.
Add the warm broth one ladle at a time, stirring frequently and allowing the liquid to be fully absorbed before adding the next ladle.
Once the rice is tender and has reached a creamy consistency, stir the cooked chicken, parmesan cheese, sea salt, black pepper, and fresh thyme back into the mixture.