Start by setting your oven to 375°F (190°C). Lightly grease your 9×13-inch baking dish to prevent sticking and ensure easy cleanup.
In a large skillet over medium heat, brown the ground beef until no pink remains. Drain any excess grease to avoid a greasy casserole.
Add onions and bell peppers to the skillet. Cook for about 5–7 minutes until softened and lightly caramelized. Stir in minced garlic for the last minute of cooking.
Reduce heat to low and stir in the cream cheese until melted. Pour in beef broth for moisture and season with salt, pepper, and paprika or steak seasoning.
Spread the beef and vegetable mixture evenly in the prepared dish. Lay provolone cheese slices on top, overlapping slightly for complete coverage.
Place in the oven and bake for 15–18 minutes until the cheese is melted and bubbly. For a golden top, broil an additional 1–2 minutes.
Allow the casserole to rest for 5 minutes before serving. It’s delicious on its own, or over toasted hoagie rolls, pasta, or rice.