Prepare the ingredients by cutting king oyster mushrooms, red bell pepper, yellow bell pepper, green onion, and onion into bite-sized pieces.

Heat a pan and add a generous amount of grapeseed oil, then sauté minced garlic.

Add green onion and onion to the pan and stir-fry until fragrant.

Add red bell pepper and yellow bell pepper to the pan.

Add king oyster mushrooms and stir-fry on high heat.

Once the mushrooms are slightly cooked, add 2 tbsp soy sauce.

Add 2 tbsp oyster sauce.

Add 2 tbsp corn syrup.

Lower the heat and stir-fry until the vegetables and mushrooms are well coated with the sauce.

Add 1 tbsp sesame oil and mix well.