Warm the chicken broth in a small saucepan over low heat to keep it ready for the rice.
Heat the olive oil in a large skillet over medium-high heat and sauté the diced chicken breast until golden and fully cooked.
Remove the chicken from the pan and set it aside on a plate.
In the same skillet, add the minced shallot and sliced mushrooms, cooking until the mushrooms are browned and fragrant.
Stir in the minced garlic and Arborio rice, toasting the grains for about one minute until they look slightly translucent.
Add the warm broth one ladle at a time, stirring constantly and waiting for the liquid to be fully absorbed before adding more.
Continue adding broth and stirring for 18 to 20 minutes until the rice is creamy and tender.
Fold the cooked chicken, parmesan cheese, sea salt, black pepper, and fresh thyme into the rice.
Serve immediately while the risotto is warm and has a rich, silky consistency.