Chicken and Rice Casserole For One

Name: Chicken and Rice Casserole For One
Prep time: 10 min
Cook time: 50 min
Total time: 1 h
Cuisine: American
Ingredients: 1 (4-ounce) boneless skinless chicken thigh (or chicken breast cut into 1-inch pieces); ¾ teaspoon kosher salt (-divided); ⅛ teaspoon coarsely ground black pepper; 1 tablespoon olive oil (-divided); ½ cup chopped onions; 1 clove garlic (-minced); ¼ cup sliced mushrooms; ⅓ cup low sodium chicken broth; 2 tablespoons sour cream; 3 tablespoons heavy cream; ¼ cup long-grain white rice; ¼ teaspoon Italian seasoning