Preheat oven to 375 degrees.

In a large skillet or saucepan, over medium-high heat, sauté ground beef, onions, and peppers for about 10 minutes, or until the beef is browned and the vegetables are tender. Remove from heat.

Drain off excess fat and season meat mixture with garlic powder and pepper.

Sir in tomatoes, rice, Worcestershire sauce and Italian seasoning. Add 1 cup cheese, and stir.

Spread mixture into a 13x9-inch casserole dish. Top with tomato sauce and remaining cheese.

Bake, uncovered, for 20 minutes, or until cheese is melted and bubbly. Let stand 5 minutes before serving.