Easiest Way to Make Appetizing Philly Cheesesteak Casserole

Philly Cheesesteak Casserole.

You can have Philly Cheesesteak Casserole using 8 ingredients and 5 steps. Here is how you achieve that.

Ingredients of Philly Cheesesteak Casserole

1. Prepare 1 of each large green, red and orange bell pepper, thinly sliced.
2. Prepare 2 T of butter.
3. You need 1 of small onion, thinly sliced.
4. Prepare 3 cloves of garlic, minced.
5. Prepare 8 oz of cremini mushrooms, thinly sliced.
6. Prepare 1-1/2 pounds of precooked, deli-style roast beef, thinly sliced.
7. You need 6 slices of provolone cheese, about 6 oz.
8. It's 1 c of shredded mozzarella cheese.

Philly Cheesesteak Casserole instructions

1. Heat butter in large deep-sided ovenproof skillet or Dutch oven over medium-low heat. Add onion and garlic and cook until onion is translucent..
2. Add mushrooms and peppers to skillet. Cook until mushrooms release their liquid and peppers are crisp-tender..
3. Preheat oven to 350°..
4. Add beef to skillet and mix with veggies. Top with provolone and sprinkle on mozzarella..
5. Bake 15 min, then finish under broiler 2-3 min until cheese is browned and bubbly..