Turn on oven to 250.
Thinly slice ribeye steak. This is best done when steak is still slightly frozen. Allow to finish unthawing as you cut and cook veggies.
Slice green pepper and onions thin.
Add 1 tbls butter to skillet over medium heat.
Cook green peppers and onions over medium heat until onions become translucent. Transfer to a plate
Add another tbls of butter in skillet. Add ribeye steak.
Sprinkle beef with seasoning salt, salt and Worcestershire sauce. Cook for a few minutes, being careful to not overcook.
Add onions and peppers back into skillet. Stir together.
Divide beef and veggies into 4-5 equal section in skillet. Top with cheese. Allow to melt.
Add butter to another skillet or griddle. Toast buns. Add a little bit of mayo to toasted buns.
Fill toasted buns with steak, veggies and cheese. Wrap up tightly in a small sheet of aluminum foil.
Heat in oven for 15 minutes. Add lettuce and tomato if desired. Enjoy!!