Heat 2 tbsp of the olive oil in a skillet over medium high heat.
Season the chicken breasts with the garlic powder and salt and pepper to taste.
Saute the chicken until browned and cooked through. Remove from the skillet.
Add the remaining olive oil to the skillet and cook the mushrooms and green onions until softened.
Sprinkle in the cornstarch, and stir until well combined and smooth.
Add in the white cooking wine and saute for 2-3 minutes. Stir in the milk slowly, and cook until the mixture is thickened.
Place the chicken on a plate and pour the sauce over top.
Garnish with parsley and serve.
Enjoy!