Add the oil to a large skillet and heat to medium-high. Allow the skillet to heat up for a few minutes, until the oil is noticeably runnier.

Add the sliced steak and move it into a single layer as best you can to allow it to get a good sear. Let it cook, undisturbed for 3 minutes before stirring and allowing it to cook another 2 to 3 minutes undisturbed, until the steak is nice and golden-brown. Keep stirring and cooking until the steak appears somewhat springy and much of the liquid has burned off.

Add the onion, bell pepper and garlic and stir well. Again, allow the mixture to sit undisturbed for a few minutes to get a golden-brown crust on the veggies.

Stir in the teriyaki sauce and continue cooking until everything is well-coated and the sauce has reduced down to more of a glaze.

Serve with your favorite side (I go with steamed brown rice) and enjoy!