Cut the snow peas in half, and add the snow peas and broccoli to the pan. Cook the veggies for a couple of minutes until softened but still crunchy. Remove from heat and set aside.
Add the olive oil, garlic and chicken to the pan, season with black pepper and cook for a few minutes until cooked through.
Add the snow peas, broccoli, onion, chilli and basil to the pan, then add the soy sauce, fish sauce and oyster sauce. Let the stir fry simmer for a few minutes until the sauce is well combined and the onion is soft.
Remove the stir fry from heat and serve over rice or noodles.