In a small pot, bring the chicken broth to a gentle simmer and keep it warm on low heat.
Season the chicken breast with half of the salt and pepper, then sear in a pan with olive oil until golden and cooked through.
Remove the chicken from the pan, let it rest for a few minutes, then slice into thin strips.
In the same pan, sauté the minced shallot, minced garlic, and sliced mushrooms until the mushrooms are tender and browned.
Add the Arborio rice to the pan and toast for one minute, stirring constantly until the edges of the grains are translucent.
Add the warm broth to the rice one ladle at a time, stirring frequently and allowing the liquid to be fully absorbed before adding more.
Continue this process for about 18-20 minutes until the rice is creamy and tender but still has a slight bite.
Stir in the Parmesan cheese and the remaining salt and pepper until the risotto is rich and glossy.
Serve the mushroom risotto in a shallow bowl topped with the sliced chicken and a garnish of fresh parsley.