Prepare the Ingredients: Slice the ribeye steak thinly and prepare the onions and peppers.
Sauté Onions and Peppers: Heat olive oil in a pan, add onions, and reduce heat to low. Stir and add water if they start to burn.
Add Garlic and Peppers: Add chopped garlic and pepper slices to the pan, season with salt and black pepper, and continue stirring.
Cook the Steak: In the same pan, add butter and oil, increase heat, and cook the thinly sliced steak for 3-4 minutes.
Combine Ingredients: Return the onions and peppers to the pan, add soy sauce if using, and mix.
Melt the Cheese: Distribute cheese slices over the mixture, reduce heat, and let it melt.
Toast the Bread: Toast the bread with a little mayonnaise or butter in a separate pan.
Assemble the Sandwich: Place the cheese and steak mixture on the toasted bread and serve.