Easy Philly Cheesesteak Casserole for a Hearty Dinner Step-by-step instructions

Before you start

Before beginning, ensure all vegetables are washed, dried, and sliced into thin strips for the peppers. Have the ground beef ready and at room temperature for about 15 minutes before cooking.

Preheat the oven to 375°F (190°C) so it is ready for the assembly phase. Have the baking dish clean and ready on the counter, and ensure all measuring tools are close at hand to keep the preparation process efficient and organized.

Instructions

Sautéing the base

1. 1Prepare the beef mixture
   Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it apart with a spatula, until browned and cooked through. Ensure the internal temperature reaches 160°F (71°C). Drain any excess grease from the skillet.
   Look for The beef should be fully browned with no pink remaining.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Drain the fat well to prevent the final casserole from becoming too oily.
2. 2Sauté the vegetables
   Add the sliced bell peppers to the skillet with the cooked beef. Continue to sauté the mixture over medium heat until the vegetables are softened, about 5 to 7 minutes.
   Look for Vegetables should be tender.
   Tip Do not overcook the peppers, as they will continue to soften in the oven.

The ground beef should be deeply browned and the liquid reduced. The peppers should be soft and fragrant, having absorbed the savory juices from the meat. Check that the vegetables are cooked to your desired level of tenderness before proceeding to the next step.

Assembling the dish

3. 3Assemble the casserole
   Transfer the beef and vegetable mixture into a 9x13 inch baking dish. Spread the mixture evenly across the bottom of the dish to create an even layer before adding the cheese topping.
   Look for The beef and vegetable mixture should be spread out in an even layer.
   Tip Use a spatula to level the surface for even cheese distribution.
4. 4Top with cheese
   Sprinkle the shredded mozzarella cheese generously over the top of the beef and vegetable layer. Ensure the entire surface is covered so the cheese melts into a cohesive layer.
   Look for The cheese should completely cover the beef and vegetables.
   Tip For extra browning, place the dish under the broiler for the last minute.

The mixture should be spread into an even layer within the baking dish. The cheese should be distributed uniformly across the top, reaching all the way to the edges of the dish. This ensures a consistent melt and a beautiful, golden crust across the entire surface.

Baking to perfection

5. 5Bake the casserole
   Place the baking dish into a preheated oven at 375°F (190°C). Bake for approximately 15 to 20 minutes, or until the cheese is melted, bubbly, and slightly golden on top.
   Look for The cheese should be bubbling and golden brown.
   Tip Watch the oven closely during the final minutes to prevent burning.
6. 6Rest and serve
   Remove the casserole from the oven and let it rest for 5 minutes before serving. This allows the juices to settle and the cheese to set slightly, making it easier to scoop.
   Look for The casserole should look set and hold its shape when scooped.
   Tip Use a sharp metal spatula to get a clean scoop of the cheesy beef layer.

The casserole should be bubbling vigorously, and the cheese should be melted into a gooey, golden layer. The aroma of roasted peppers and browned beef should be noticeable in the kitchen. Ensure the dish is heated through completely before removing it from the oven.

Common mistakes

Avoid overcrowding the skillet when browning the ground beef, as this can cause the meat to steam rather than sear, leading to a less flavorful result.

Another common mistake is failing to drain the excess grease after browning the beef, which can make the final dish overly oily.

Ensure the bell peppers are sliced thinly; large chunks may not soften enough in the oven. Finally, do not skip the resting period, as this is essential for the structure of the casserole.

How to tell it’s done

The casserole is done when the internal temperature of the beef mixture reaches 160°F (71°C) and the cheese on top is completely melted, bubbling, and showing golden brown spots. Use an instant-read thermometer inserted into the center of the dish to verify the temperature.

The edges should be slightly crispy, and the overall appearance should be hot and steaming throughout. If the top browns too quickly, cover it loosely with foil for the remainder of the baking time.

• Ground meat: 160°F (71°C) in the thickest part