Dice the onions and green pepper into small pieces. In a large saute pan, brown the hamburger with the onion and drain any excess grease. Add the green bell peppers and saute. Add the sour cream, Worcestershire sauce, and seasonings to meat and onions. Taste the mixture and add more salt and garlic powder as desired. Cut the French bread horizontally and both halves on a cookie sheet. Spread meat mixture on both sides of the bread. Slice the tomatoes and put on top of the French bread and sprinkle the cheese all over the top of the bread. Bake until cheese is melted at 350 for about 10-12 minutes.