In a medium mixing bowl use a fork to mash tofu. Stir in cheese, mayonnaise or salad dressing, mustard, and garlic salt; mix well. Spread tofu mixture on each bagel or English muffin half. Place on a baking sheet.
Broil 4 to 5 inches from the heat about 4 minutes or till light brown. Top with tomato and alfalfa sprouts.