Prepare all ingredients by slicing the chicken and vegetables.
Heat the vegetable oil in a large pan or wok over medium-high heat.
Add minced garlic and grated ginger, sauté for 30 seconds until fragrant.
Add sliced chicken to the pan, cooking until browned and cooked through.
Stir in the mixed vegetables and cook for 3-4 minutes until tender-crisp.
Pour soy sauce and oyster sauce over the chicken and vegetables.
Toss everything together to coat evenly in the sauce.
Cook for an additional 1-2 minutes until heated through.
Remove from heat and garnish with chopped green onions and sesame seeds.
Serve hot over cooked rice or noodles.