In large zip lock bag or deep dish, mix fajita mix with 2 tbsp. oil, 1/2 cup water until well combined. Add steak strips and mix around until all meat is covered well. I like using zip lock bags so it lays flat and marinade spreads easily over all the strips. Marinate for 30 minutes.

In skillet, melt butter or oil over medium heat. Add strips of peppers and onions. I add a sprinkle of fajita seasoning to this just for taste. Cook until slightly tender. I like mine with a little firmness. Remove from skillet to bowl or plate.

Cook the strips of steaks in butter or oil on medium high heat until cooked to your liking. These are medium. I like to crank the up at first to get a nice sear on the strips.

When steak is cooked to your liking, add the onion and pepper mixture to steak and season with more fajita seasoning or salt and pepper. Really any seasoning you like. Turn off heat.