Preheat the Oven: heat oven to 425°F.
Prep the Chicken: Season the chicken breasts with salt and pepper. Heat olive oil in a large, oven-proof skillet over medium heat. Add the chicken and cook until golden brown on both sides, about 5 minutes on each side. Remove from the skillet and set aside.
In the same skillet, add the chopped onions and cook until they’re translucent. Add the minced garlic and sliced mushrooms, and sauté until the mushrooms are tender and browned. Add the wine and simmer until nearly evaporated.
Mix the soup, cheese, green onions and sage together in a small bowl.
Return the chicken to the skillet, nestling it into the mushrooms. Cover with the soup mixture. Bake, uncovered in the preheated oven until cooked through, about 20 minutes.
Spoon a generous portion of fluffy rice onto each plate, top with a chicken breast, and ladle over the creamy mushroom sauce.