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 in 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.
How to Make Keto Philly Cheesesteak Casserole
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.
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.
STEP 3: Add the roast beef to the skillet and mix with the vegetables.
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.
Recipe Tips and Variations
Frequently Asked Questions
Philly cheesesteaks are traditionally made with thinly sliced ribeye.
Provolone cheese is traditionally used for Philly cheesesteak.
What to Serve with Philly Cheesesteak Casserole
More Low Carb Philly Cheesesteak Recipes
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Philly Cheesesteak Casserole
- Total Time: 45 minutes
- Yield: 6 servings 1x
- Diet: Gluten Free
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
- 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
- Cut the tops off the peppers, remove the ribs and seeds, and thinly slice the peppers. Set aside.
- 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.
- Add the mushrooms and peppers to the skillet. Cook until the mushrooms release their liquid and the peppers are crisp-tender, about 10 minutes.
- Preheat the oven to 350°F.
- 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.
- 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
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!
Teri says
Wow!!! This was soooo easy and so amazing!! Definitely will be adding this to my rotation!!
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!
Kyndra Holley says
Yes, that would work just fine.
Christine Oliver says
I don’t have provolone cheese can I just use mozzarella?
Kyndra Holley says
yes
Barbara says
Can you use steak umms
Kyndra Holley says
Sure
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!