Saute the crumbled tofu in half of the olive oil with salt and pepper until browned. Meanwhile, toast the bagel. Spread each toasted bagel half withe the avocado. Place tomato slices on each bagel half. When tofu is brown, add chopped peppers, onion and mushrooms. This is when you may need to add more olive oil. Howe'ver, remember, mushrooms are mostly water and will add to the saute juices in the pan. When peppers are tender, onions are glossy and mushrooms are sauted; heap tofu/veggie mixture on to bagel halves. Top with black olives. If you are using soya cheese, place a slice on each half and broil until the cheese has melted. Serve at once.