Indulge in the classic flavors of a Philly steak sandwich with this easy slow cooker recipe. Perfect for busy days, this dish combines tender beef sirloin, savory vegetables, and melted provolone cheese to create a mouthwatering meal that requires minimal effort.
If you don't usually keep beef sirloin or provolone cheese at home, you'll need to pick these up at the supermarket. Make sure to get the beef sirloin thinly sliced for the best texture. Also, fresh green bell peppers and hoagie rolls might not be in your pantry, so add those to your shopping list.

Ingredients For Slow Cooker Philly Steak Sandwich Recipe
Beef sirloin: Thinly sliced for tenderness and flavor.
Green bell pepper: Adds a fresh, slightly sweet crunch.
Onion: Provides a savory depth to the dish.
Garlic: Enhances the overall flavor with its aromatic qualities.
Beef broth: Keeps the meat moist and adds a rich, beefy flavor.
Salt: Essential for seasoning and enhancing flavors.
Black pepper: Adds a hint of spice and complexity.
Hoagie rolls: The perfect vessel for holding the delicious filling.
Provolone cheese: Melts beautifully over the beef mixture, adding a creamy texture.
Technique Tip for This Recipe
To enhance the flavor of your beef sirloin, consider searing it in a hot pan for a few minutes before placing it in the slow cooker. This will create a caramelized crust that adds depth to the overall taste of your Philly steak sandwich.
Suggested Side Dishes
Alternative Ingredients
beef sirloin - Substitute with chicken breast: Chicken breast can provide a leaner option and still absorb the flavors well.
green bell pepper - Substitute with red bell pepper: Red bell peppers are sweeter and can add a different flavor profile while maintaining the pepper texture.
onion - Substitute with shallots: Shallots have a milder taste and can add a subtle sweetness to the dish.
garlic - Substitute with garlic powder: Garlic powder can provide a similar flavor and is convenient if fresh garlic is not available.
beef broth - Substitute with chicken broth: Chicken broth can be used as a lighter alternative while still adding depth to the flavor.
salt - Substitute with soy sauce: Soy sauce can add a salty and umami flavor, enhancing the overall taste.
black pepper - Substitute with white pepper: White pepper has a slightly different heat and can add a unique flavor without altering the color of the dish.
hoagie rolls - Substitute with whole wheat rolls: Whole wheat rolls provide a healthier option with more fiber and nutrients.
provolone cheese - Substitute with mozzarella cheese: Mozzarella cheese melts well and has a mild flavor that complements the other ingredients.
Other Alternative Recipes
How To Store / Freeze Your Sandwich
- Allow the beef mixture to cool completely before storing. This helps prevent condensation, which can lead to soggy hoagie rolls.
- Transfer the cooled beef mixture into an airtight container. Make sure to include the bell peppers and onions for maximum flavor.
- Store the container in the refrigerator if you plan to consume the sandwiches within 3-4 days.
- For longer storage, place the beef mixture in a freezer-safe container or heavy-duty freezer bags. Label with the date to keep track of freshness.
- When ready to use, thaw the beef mixture in the refrigerator overnight if frozen.
- Reheat the beef mixture in a saucepan over medium heat until warmed through, or use a microwave-safe dish and heat in the microwave.
- Assemble the sandwiches by filling the hoagie rolls with the reheated beef mixture and topping with provolone cheese slices.
- Preheat the oven to 350°F (175°C) and place the sandwiches in the oven for 5 minutes or until the cheese is melted and bubbly.
- Enjoy your Slow Cooker Philly Steak Sandwiches with a side of fries or a salad for a complete meal.
How To Reheat Leftovers
Preheat your oven to 350°F (175°C). Wrap the hoagie rolls filled with the beef mixture and provolone cheese in aluminum foil. Place them in the oven for about 10-15 minutes, or until the cheese is melted and the sandwich is heated through.
For a quicker method, use a microwave. Place the sandwich on a microwave-safe plate and cover it with a damp paper towel to retain moisture. Heat on medium power for 1-2 minutes, checking halfway through to ensure even heating.
If you prefer a crispy texture, use a toaster oven. Set it to 350°F (175°C) and place the sandwich directly on the rack or on a baking sheet. Toast for about 5-7 minutes, or until the cheese is melted and the bread is slightly crispy.
For stovetop reheating, use a skillet over medium heat. Place the sandwich in the skillet and cover with a lid. Heat for about 3-5 minutes on each side, or until the cheese is melted and the beef mixture is warmed through.
If you have an air fryer, preheat it to 350°F (175°C). Place the sandwich in the basket and cook for about 3-5 minutes, or until the cheese is melted and the bread is crispy.
Best Tools for This Recipe
Slow cooker: used to cook the beef, bell pepper, onion, garlic, beef broth, salt, and black pepper slowly over 8 hours to develop deep flavors.
Knife: essential for thinly slicing the beef sirloin, green bell pepper, and onion.
Cutting board: provides a safe and stable surface for slicing the beef, bell pepper, and onion.
Garlic press: used to mince the garlic cloves efficiently.
Measuring cups: used to measure the beef broth accurately.
Measuring spoons: used to measure the salt and black pepper precisely.
Oven: preheated to 350°F (175°C) to melt the provolone cheese on the sandwiches.
Baking sheet: used to place the hoagie rolls filled with the beef mixture and cheese in the oven.
Tongs: useful for handling the hot beef mixture when filling the hoagie rolls.
Serving platter: used to present the finished Philly steak sandwiches.
How to Save Time on This Recipe
Pre-slice ingredients: Buy pre-sliced beef sirloin, bell pepper, and onion to save prep time.
Use garlic paste: Substitute minced garlic with garlic paste for quicker preparation.
Slow cooker liners: Use slow cooker liners to minimize cleanup time.
Preheat oven early: Preheat the oven while the slow cooker is finishing to save time.
Assemble ahead: Assemble the hoagie rolls and provolone cheese slices while the beef mixture is cooking.

Slow Cooker Philly Steak Sandwich Recipe
Ingredients
Main Ingredients
- 1 lb Beef sirloin, thinly sliced
- 1 unit Green bell pepper, sliced
- 1 unit Onion, sliced
- 2 cloves Garlic, minced
- 1 cup Beef broth
- 1 teaspoon Salt
- 1 teaspoon Black pepper
- 4 units Hoagie rolls
- 8 slices Provolone cheese
Instructions
- 1. Place beef, bell pepper, onion, garlic, beef broth, salt, and black pepper in the slow cooker.
- 2. Cook on low for 8 hours.
- 3. Preheat oven to 350°F (175°C).
- 4. Fill hoagie rolls with the beef mixture and top with provolone cheese slices.
- 5. Place sandwiches in the oven for 5 minutes or until cheese is melted.
Nutritional Value
Keywords
Suggested Appetizers and Desserts
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