Steak Fajita Sandwich with Caramelized Onions, Mushrooms, and Peppers Recipe - (4.5/5)

Name: Steak Fajita Sandwich with Caramelized Onions, Mushrooms, and Peppers Recipe - (4.5/5)
Cuisine: American, Mexican, Latin American, TexMex
Ingredients: 1 lb. thin sirloin steak; 1 stick of butter; country white bread; 2 bell peppers, sliced; 1 white onion, sliced; 1 small container of mushrooms, sliced; 1 tbsp. creole seasoning; 1/2 tbsp. Mexican chili powder; 1/2 tbsp. garlic powder; 1/2 tbsp. dried Mexican oregano, crushed; 2 tsp. cayenne pepper; extra virgin olive oil; pepper jack cheese; cheddar cheese