Cut the chicken tenderloin into bite-sized pieces.
Prepare the potatoes and mixed vegetables (onion, carrot, broccoli, etc.) into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the chicken tenderloin first.
When the chicken is half cooked, add the potatoes and vegetables and stir-fry together.
Season with salt, pepper, etc.
Once the chicken and vegetables are cooked, turn off the heat and serve on a plate.