Season the chicken breast with half of the sea salt and black pepper.
In a large skillet, sear the chicken over medium heat until golden and cooked through, then remove and set aside to rest.
In the same pan, heat the olive oil and sauté the shallots, garlic, and sliced mushrooms until the mushrooms release their moisture and turn velvety.
Add the dry arborio rice to the pan, stirring for one minute to lightly toast the grains.
Warm the vegetable broth in a separate pot and begin adding it to the rice half a cup at a time.
Stir the rice frequently, allowing the liquid to be fully absorbed before adding the next ladle of broth.
Once the rice is tender and has reached a creamy consistency, stir in the parmesan cheese, fresh thyme, and the remaining salt and pepper.
Slice the rested chicken breast and serve it over the warm mushroom risotto.