Fridge-raid fried rice

Name: Fridge-raid fried rice
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: Asian, Chinese
Ingredients: 2 tbsp vegetable oil; 1 white onion, finely chopped; 1 carrot, finely chopped; 100g green beans, chopped; 1 red or yellow pepper, finely chopped; ½ medium broccoli, chopped into small florets; 150g cooked chicken (or any other meat), roughly chopped, optional; 300g cold cooked rice; 2 eggs, beaten; 1 tbsp sesame oil; 1 tbsp oyster sauce; 1 spring onion, finely sliced; 1 tsp toasted sesame seeds