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Steak Fajita Sandwich with Caramelized Onions, Mushrooms, and Peppers


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Rate this recipe 4.5/5 (18 Votes)


  • 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


Adapted from


Step 1

Mix seasoning blend and set aside. Rinse steaks and pat dry. In a large bowl place steaks and about 4 tablespoons of olive oil, mix well. Season steaks with half of the seasoning blend and mix well.

You can allow steak to marinate for about 30 minutes if you have the time, are overnight. Heat a large skillet over medium high heat, add 1/2 stick of butter and 3 tablespoons of olive oil.

Cook steaks about 3-4 minutes on each side, depending on thickness and desired level of doneness preferred. Remove steaks from pan and repeat if necessary. Add remaining butter and more olive oil, saute peppers and onions for about 10 minutes, season with remaining seasoning blend.

Add mushrooms and cook about 5 minutes more. Toast bread, top with cheese, add hot vegetables, top with steak and a little of the pan juices and enjoy.

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