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Keto Philly Cheesesteak Casserole

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Jump to Recipe·Print Recipe·5 from 3 reviews

This Keto Philly Cheesesteak Casserole Recipe comes together in less than 30 minutes, and only dirties one pan. Tender roast beef, a medley of bell peppers, sweet onions, mushrooms, and garlic, topped with melty cheese. It is the perfect easy weeknight dinner.

a cast iron skillet full of a casserole with meat, cheese, and vegetables.
Table of Contents show

Ingredients in Philly Cheesesteak Casserole

ingredients all laid out to make keto Philly cheesesteak casserole.

Ingredients Notes

The ingredients in a traditional Philly cheesesteak sandwich can be highly debated and are something that a lot of people have strong feelings about. This Keto Philly cheesesteak recipe might not be traditional, but it sure tastes delicious.

  • Roast beef: Traditionally, a Philly cheesesteak is made with thinly sliced ribeye steak. For this keto casserole recipe, I chose to use a deli style roast beef.
  • Bell peppers: Whenever I cook with bell peppers, I always like to use a medley of colors - yellow, orange, red, and green. It's adds so much color to the dish and each variety has a different flavor. (Try these Philly Cheesesteak Stuffed Peppers)
  • Onion: For this recipe I recommend using white onions or sweet onions. (Try this Philly Cheesesteak French Onion Soup)
  • Mushrooms: While mushrooms aren't an ingredient in a classic cheesesteak, they make a delicious addition to this casserole. I used cremini, but you can any variety of mushroom you prefer.
  • Cheese: I used a combination of provolone and mozzarella, but gruyere, fontina, and sharp white cheddar cheese are great option also. It's also delicious with my Keto Cheese Sauce on top.

How to Make Keto Philly Cheesesteak Casserole

a cast iron skillet with sautéed mushrooms and onions being cooked with a rubber spatula.

Step by Step Instructions

STEP 1: Preheat the oven to 350°F. Heat the butter in a large deep-sided ovenproof skillet or Dutch oven over medium-low heat. Add the onion and garlic and cook until the onion is translucent and the garlic is fragrant, about 7 minutes.

a cast iron skillet with sautéed mushrooms, garlic, peppers, and onions being cooked with a rubber spatula.

STEP 2: Add the mushrooms and peppers to the skillet. Cook until the mushrooms release their liquid and the peppers are crisp-tender, about 10 minutes.

a cast iron skillet with sautéed roast beef, mushrooms, garlic, peppers, and onions

STEP 3: Add the roast beef to the skillet and mix with the vegetables.

a cast iron skillet with sautéed roast beef, mushrooms, garlic, peppers, and onions, topped with cheese

STEP 4: Top with the provolone cheese, then sprinkle the mozzarella cheese over the top. Bake for 15 minutes, then finish under the broiler for 2 to 3 minutes, until the cheese is browned and bubbling.

a cast iron skillet with a Philly cheesesteak casserole in it.

Recipe Tips and Variations

  • Storage: Store leftovers in the refrigerator for up to 5 days.
  • Reheating: I recommend reheating this philly cheesesteak casserole in the oven, or on the stovetop.
  • Meal prep: This recipe heats really well and makes for great make-ahead meal prep.
  • Beef: For this keto Philly cheesesteak casserole recipe, I chose to use a thinly sliced deli style roast beef. You can use ribeye, which is more traditional, or any cut of beef you prefer. It is even great with ground beef.
  • Change up the cheese: This is also delicious with parmesan, fontina, gruyere, sharp white cheddar, cream cheese, or any combination of those.
  • Make a sandwich: Pile this philly cheese steak casserole on top of one of my Keto Everything Buns and make a keto Philly cheesesteak sandwich.
  • Spice it up: For a little more kick, add some of these Pickled Jalapeños.

Frequently Asked Questions

What type of meat is in a Philly cheesesteak?

Philly cheesesteaks are traditionally made with thinly sliced ribeye.

What kind of cheese is on a Philly cheesesteak?

Provolone cheese is traditionally used for Philly cheesesteak.

a bowl of Philly cheesesteak - peppers, onions, mushrooms, garlic, cheese

What to Serve with Philly Cheesesteak Casserole

a cast iron skillet with a Philly cheesesteak casserole in it.

More Low Carb Philly Cheesesteak Recipes

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a cast iron skillet with a Philly cheesesteak casserole in it.

Philly Cheesesteak Casserole

5 Stars 4 Stars 3 Stars 2 Stars 1 Star

5 from 3 reviews

  • Author: Kyndra Holley
  • Total Time: 45 minutes
  • Yield: 6 servings 1x
  • Diet: Gluten Free
Print Recipe

Description

This Keto Philly Cheesesteak Casserole Recipe comes together in less than 30 minutes, and only dirties one pan. Tender roast beef, a medley of bell peppers, sweet onions, mushrooms, and garlic, topped with melty cheese. It is the perfect easy weeknight dinner.

Ingredients

Units Scale
  • 1 large green bell pepper
  • 1 large yellow bell pepper
  • 1 large red bell pepper
  • 2 tablespoons salted butter
  • 1 small onion, thinly sliced (about ½ cup)
  • 3 cloves garlic, minced
  • 8 ounces cremini mushrooms, thinly sliced
  • 1 ½ pounds deli- style roast beef, thinly sliced
  • 6 slices provolone cheese (about 6 ounces)
  • 1 cup shredded shredded mozzarella cheese

Instructions

  1. Cut the tops off the peppers, remove the ribs and seeds, and thinly slice the peppers. Set aside.
  2. Heat the butter in a large deep-sided ovenproof skillet or Dutch oven over medium-low heat. Add the onion and garlic and cook until the onion is translucent and the garlic is fragrant, about 7 minutes.
  3. Add the mushrooms and peppers to the skillet. Cook until the mushrooms release their liquid and the peppers are crisp-tender, about 10 minutes.
  4. Preheat the oven to 350°F.
  5. Add the roast beef to the skillet and mix with the vegetables. Taste, and add salt and pepper, if desired. Top with the provolone cheese, then sprinkle the mozzarella cheese over the top.
  6. Bake for 15 minutes, then finish under the broiler for 2 to 3 minutes, until the cheese is browned and bubbling.

Notes

  • Net carbs per serving: 5.3g
  • Storage: Store leftovers in the refrigerator for up to 5 days.
  • Reheating: I recommend reheating this in the oven or in a pan on the stovetop.
  • Beef: For this keto Philly cheesesteak casserole recipe, I chose to use a thinly sliced deli style roast beef. You can use ribeye, which is more traditional, or any cut of beef you prefer. It is even great with ground beef. 
  • Prep Time: 15 minutes
  • Cook Time: 30 minutes
  • Category: Casserole Recipes
  • Method: Baking
  • Cuisine: American

Nutrition

  • Calories: 272
  • Fat: 16g
  • Carbohydrates: 7g
  • Fiber: 1.7g
  • Protein: 27g

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Reader Interactions

Comments

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  1. Teri says

    Made this for the family a few nights ago. It was soooo easy! Everyone loved it! It's going to be added to the rotation!

    Reply

  2. Teri says

    Wow!!! This was soooo easy and so amazing!! Definitely will be adding this to my rotation!!

    Reply

  3. Margaret Schindel says

    Hi Kyndra!

    My husband and I love Philly cheesesteaks. We have only a countertop oven that won’t accommodate a large frying pan. Can I prepare the recipe as directed and transfer it to a greased casserole before topping with the cheeses and baking?

    Thanks very much!

    Reply

    • Kyndra Holley says

      Yes, that would work just fine.

      Reply

  4. Christine Oliver says

    I don’t have provolone cheese can I just use mozzarella?

    Reply

    • Kyndra Holley says

      yes

      Reply

  5. Barbara says

    Can you use steak umms

    Reply

    • Kyndra Holley says

      Sure

      Reply

  6. Tara says

    Loved it! I added a little beef broth. Just had the leftovers for lunch! So good. Left out the mushrooms since hubby doesn’t like them!

    Reply