Add the corn and peas to the fry-pan. Return the mixture to fry-pan, cook for 1 minute. Push the mince mixture out to the side. Pour in the combined soy sauce, oyster sauce, water and cornflour, stir as it comes to the boil. Stir to mix the sauce with the mince mixture. Add the noodles if using, stir to combine. Spoon the mince into a serving bowl. Serve with steamed rice.