All the classic Philly Cheesesteak flavors in casserole form! Easy to make for multiple sandwiches or serve the Philly Cheesesteak in lettuce wraps or over rice! YUM!
When prepping steak, it helps if the steak is very cold. Slice steak into very thin slices and then chop into 1-2 inch chunks. Season steak with half of all the spices.
Add 1 tablespoon of olive oil to a large skillet over medium-high heat. Once shimmering hot, add steak and cook until steak is cooked through and browned, maybe 4-5 minutes.
Remove steak from the skillet, add a fresh drizzle of oil and add the peppers and onions along with the rest of the spices. Cook until veggies are tender and caramelized in spots.
Transfer cooked peppers to a large 9×13 baking dish and spread out evenly. Top with steak.
Drizzle about 1 cup of Cheez Whiz over the surface of the steak and then cover with Provolone cheese slices.
Bake casserole for 8-10 minutes to warm through well and completely melt cheese. Garnish finished casserole with fresh parsley.
Serve Philly Cheesesteak Casserole with rolls or over rice. For a low-carb version, try it with lettuce wraps!
Leftover casserole keeps great in the fridge fro 3-4 days and can be reheated in the microwave in short 30 second bursts until steak is warm and cheese is re-melted.