Philly Cheesesteak Sandwich- A Leftovers Recipe

Our Philly Cheesesteak Sandwich recipe is the perfect way to use up leftover roast beef or steak. Here we will show you step by step our quick simple recipe. #mealsunder30min

Hi and welcome to The Old Summers Home and another edition of Cooking with Jenn! Today I’m going to show you how to make our Philly Cheesesteak Sandwich, because it is so simple and gourmet delicious I know you will love it!. An open-sandwich recipe that is quick and delicious; a perfect use for our leftover Roast Beef Perfection!

Not very often do we have leftover roast beef but when we do I like to whip up a whole new dish with it. This is a quick, easy to make meal that is absolutely delicious. For this post I’m going to show you how to make it from our leftover roast beef recipe which I hope has become a favourite for you and yours too!. You can also use leftover steak or cook up some fresh meat too. Utilizing leftovers certainly can be challenging sometimes I hope this recipe helps.

Philly Cheesesteak Total Time

30 minutes start to finish.


  • cutting board
  • knives (for slicing meat, veggies, and bread knife)
  • cheese grater
  • large frying pan and lid
  • tongs
  • cookie sheet
  • parchment paper

Philly Cheesesteak Ingredients

  • 2-3 cups leftover roast beef
  • 1 large onion
  • 1 red pepper
  • 1 yellow pepper
  • 1 cup mushrooms
  • mix of spices (seasoning salt, Montreal steak spice, pepper)
  • 5 tbsp Hoisin Sauce
  • 3-4 tbsp Worcestershire sauce
  • 5 tbsp Oyster Sauce
  • 1/4 cup original Kraft BBQ sauce
  • 1 loaf French bread
  • 1 cup old cheese
  • 1 cup mozzarella cheese
  • Alternatively use 2 cups marble cheese.

Let’s cook up some Philly Cheesesteak

Preheat oven to 400ºF

*If you decide to use fresh meat for this recipe you will need to cook it up first and season then come back to this step.

Slice onions peppers and mushrooms into slices.

First things first, chop all your peppers, mushrooms and onions into slices and strips. Toss them into a frying pan and cover with lid.

Sauté onions peppers and mushroom slices.

Slice up your roast into long thin strips. Once onions and peppers begin to soften up and have cooked a bit add the roast beef strips. (If you have leftover cooked steak it works well too.)

Now add your hoisin sauce, oyster sauce, Worcestershire sauce and BBQ sauce and ensure to mix well so everything is nicely covered. You may add 1/4 cup of water if needed however it most likely wont be necessary peppers and mushrooms have a lot of moisture.

Add leftover roast beef strips to pan as well as sauces.

Season with mix of spices. Because the meat was seasoned in it’s original cooking process not much seasoning is required now.

Add a bit more seasoning to your Philly cheesesteak sandwich mixture

Mix well and simmer until meat is reheated.

Simmer until fully heated. Your Philly cheesesteak topping is ready for the next step.

Slice French bread into 1 inch slices. Lay a sheet of parchment paper on cookie sheet then place bread on top. Using parchment paper will help make clean up a snap.

Slice French bread into 1 inch slices

Grate cheese. Use approximately 1 cup of each or 2 cups of marble cheese if you prefer.

Grate 1 cup of old cheddar and 1 cup of mozzarella. Alternatively substitute with 2 cups of marble

Put a little bit of cheese on your French bread.

Put a bit of cheese on the French bread.

Using tongs add some of your Philly cheesesteak mixture on top of the cheese.

Add some Philly cheesesteak topping to your sandwich

Add remainder of cheese on top of the Philly cheesesteak mixture.

Top your Philly cheesesteak sandwiches with remainder of cheese

Bake in oven for 10 mins or until cheese melts and bread is a bit crisp at 400ºF. Carefully remove from oven and serve. Finally it’s time to enjoy!

Bake at 400ºF until cheese melts

And that’s a wrap… well a Philly Cheesesteak Sandwich 😉

If you have leftover mashed potatoes and carrots from your roast beef perfection dish they also make a great side for this dish and another way t use up some more leftovers. Furthermore you can use any of your favourite side dishes too! We love to pair it with fresh home fries when we don’t have other leftovers that need to be used up too.

Enjoy your Philly cheesesteak sandwich with you favourite side dishes or leftover mashed potatoes and carrots.

This is a quick and easy way to use up leftovers which furthermore can be completed in under half an hour! The taste is amazing and most certainly will have your family asking for more.

I hope you enjoyed this recipe and come back for more, we would love to have you sign up to our newsletter so you never miss a thing! Bon Appétit!

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Until next time;

Jenn Summers

The Old Summers Home

26 thoughts on “Philly Cheesesteak Sandwich- A Leftovers Recipe

    • Jenn Summers says:

      I totally hear you! I’ve started to make bigger roasts haha. You can however cook up your meat prior to the first step add the mixed spices while cooking the meat and you’re good to go. 🙂

    • Jenn Summers says:

      It tastes so good to haha. We always seem to have some sort of leftovers in the fridge I like to find quick simple ways to remake them into something delicious. Hope you enjoy it!

  1. jenny bhatia says:

    This is a great plan for use of that leftover meat, could really be anything, chicken, beef or pork. Love this recipe and I will add it to my weekly meal planning. I love when I can plan for more than two days in a row! Seriously, not good at it.

    • Jenn Summers says:

      Yes me too I try to find something big to make with plenty of leftovers that we can use during the week in other meals but it is definitely not very easy. I really need to sit down and start doing some meal planning. Perhaps my next project should be a big board for meal prep.Thanks for stopping by Jenny hope you enjoy this recipe.

  2. Jade says:

    Jenn, I’m going to the shop tomorrow to get ingredients for this. I know it’s supposed to be for leftovers but *shrug* some things are worth it hahah

    • Jenn Summers says:

      Lol yes Jade. You can use fresh beef in slices too Jade. Just use seasoning and fry up your meat for the first step then set aside and move to step one in this recipe. Hope you enjoy it.

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