Philly Cheesesteak Grilled Cheese Casserole (Print Version)
# Ingredients:
→ Philly Filling
01 -
9 oz thinly sliced roast beef
02 -
1 cup yellow onion, diced
03 -
1 cup green bell pepper, diced
04 -
0.87 oz brown gravy mix packet
05 -
1/2 cup water
→ Casserole Assembly
06 -
12 slices white or whole wheat bread
07 -
1/2 cup margarine or butter, softened
08 -
4 cups shredded mozzarella cheese
# Instructions:
01 -
Preheat your oven to 400°F and grease a 9x13 inch baking dish. Chop the roast beef slices into bite-sized pieces - this makes it easier to eat and distributes the flavor better throughout the casserole.
02 -
Heat a large skillet over medium-high heat with a dab of butter or margarine. Add the chopped roast beef, diced onions, and green peppers. Cook everything together, stirring frequently, until the onions become translucent and the peppers start to soften - about 5-7 minutes.
03 -
Sprinkle the brown gravy mix over the beef and vegetables, then add the water. Stir everything together until the gravy coats all the ingredients evenly. This creates that rich, savory base that ties all the flavors together. Remove from heat and set aside.
04 -
Spread 1/4 cup of margarine on 6 slices of bread, then cut each slice in half. Place these pieces margarine-side down in a single layer in your greased baking dish. Sprinkle 2 cups of mozzarella cheese over the bread layer.
05 -
Spoon the roast beef mixture evenly over the cheese layer, spreading it out to cover the bread completely. Top with the remaining 2 cups of mozzarella cheese - this creates those amazing gooey, stretchy layers.
06 -
Spread margarine on the remaining 6 slices of bread and cut them in half. Place these pieces margarine-side up on top of the casserole in a single layer. Bake for 26-30 minutes until the top bread is golden brown and the cheese is bubbly.
07 -
Let the casserole rest for about 5 minutes before slicing - this helps it hold together better. Cut into squares and serve immediately while the cheese is still melted and gooey. This is comfort food at its finest!
# Notes:
01 -
Using thinly sliced deli roast beef works best for authentic Philly flavors
02 -
The gravy mix helps bind everything together and adds extra savory flavor
03 -
You can substitute provolone or American cheese for a more traditional Philly taste
04 -
This casserole reheats well in the oven at 350°F for about 15 minutes