Hamburger Supreme Casserole: The Ultimate One-Pan Comfort Food Step-by-step instructions

Before you start

Before you begin cooking, ensure all your ingredients are measured and ready. Finely dice the red bell peppers to ensure they cook evenly with the beef. Shred the cheddar cheese yourself from a block rather than using pre-shredded varieties, as this ensures a smoother, more consistent melt.

Preheat your oven to 375°F (190°C) so it is ready for the final baking stage. Clear your workspace to allow for efficient movement between the stovetop and the counter, and have your baking dish cleaned and dried.

Instructions

Stovetop Sautéing

1. 1Sauté the Beef and Peppers
   Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it apart with a wooden spoon, until browned and no longer pink. Add the diced red bell peppers and sauté until they are slightly softened. Drain any excess grease from the pan to ensure the casserole does not become overly oily.
   Look for The beef should be fully browned and the peppers tender-crisp.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Ensure the beef reaches 160°F (71°C) to guarantee safety.

At the end of this phase, the ground beef should be deeply browned and fragrant, with the red peppers softened but still holding their shape. The mixture should smell savory and slightly sweet from the peppers.

Ensure you have drained any excess fat from the skillet before proceeding to the sauce integration, as this is the key to a clean, non-greasy final texture.

Sauce Integration

2. 2Prepare the Creamy Sauce
   Reduce the heat to low. Stir in the tomato sauce and the sour cream. Mix thoroughly until the sauce is uniform in color and texture. Simmer for a few minutes to allow the flavors to meld together. Once the sauce is smooth and hot, remove from the heat and transfer the mixture into a 9x13 inch glass baking dish.
   Look for The sauce should be smooth, creamy, and heated through.
   Tip Do not boil the sauce vigorously after adding the sour cream to prevent it from curdling.

The sauce should be thick, creamy, and uniform in color. As you fold in the sour cream, the mixture will take on a lighter, luscious hue. It should be hot to the touch and smell rich and inviting. Check that there are no streaks of sour cream remaining before transferring the mixture into the baking dish, ensuring a consistent flavor in every bite.

Final Baking

3. 3Bake and Garnish
   Spread the beef mixture evenly in the baking dish. Top generously with the shredded cheddar cheese. Place the dish in a preheated oven at 375°F (190°C) and bake until the cheese is bubbling and golden brown. Remove from the oven, let it rest for five minutes, and garnish with freshly chopped parsley before serving.
   Look for The cheese should be melted and bubbling across the entire surface.
   Tip Broil for the final minute if you prefer a deeper golden color on the cheese.

The casserole is finished when the cheese is fully melted, bubbling at the edges of the dish, and showing spots of golden brown. The internal heat should be consistent throughout. Once removed from the oven, the casserole needs a brief resting period to allow the sauce to settle, which makes it much easier to scoop and serve without it falling apart on the plate.

Common mistakes

Avoid overcooking the red peppers during the initial browning phase, as they should retain a slight texture rather than turning into mush. Another common mistake is failing to drain the rendered fat from the skillet, which can lead to a greasy, oily sauce.

Finally, do not add the sour cream while the pan is on high heat, as this can cause the dairy to curdle and break, ruining the smooth texture of your sauce.

How to tell it’s done

The casserole is considered done when the center is bubbling vigorously and the cheese topping has transformed into a beautiful, golden-brown crust.

Because the beef is fully cooked during the stovetop phase, the final oven time is primarily for melting the cheese and marrying the flavors. Ensure that the internal temperature of the beef mixture is at least 160°F (71°C) before serving to ensure food safety.

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