Easy congee with chicken & mushroom (香菇鸡肉粥)

Name: Easy congee with chicken & mushroom (香菇鸡肉粥)
Prep time: 3 min
Cook time: 12 min
Total time: 15 min
Cuisine: Chinese
Ingredients: 1 cup short-grain, or jasmine rice (uncooked) (about 210g, see note 1); 6 cups boiling water (about 1½ litre); 4 dried shiitake mushrooms, rehydrated & thinly sliced; ½ tsp salt; 1 piece chicken breast, cut into narrow strips/thin slices (about 150g/5.3oz); 1 tsp light soy sauce; 1 tsp oyster sauce; ½ tsp Shaoxing rice wine; ½ tsp cornstarch; ½ tsp sesame oil; 1 pinch ground white pepper; 1 pinch salt; 1 pinch sugar; 1 tbsp minced ginger; 2 stalks scallions, finely chopped; 2 boiled eggs (optional); 4 tbsp toasted peanuts, crushed (optional, see note 2)