Cut potatoes, vegetables, and squid into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the potatoes first.
When the potatoes are halfway cooked, add the vegetables and stir-fry.
Add the squid and stir-fry together.
Season with salt, pepper, and other seasonings to taste.
Once the squid is cooked, turn off the heat and serve on a plate.