In small saucepan, heat soup over medium-high heat until hot, stirring occasionally.
Meanwhile, in small bowl, combine cheeses; mix well.
Set oven control to broil. To serve, place 2 ovenproof bowls on cookie sheet for easier handling. Ladle soup into bowls. Top each with slice of toasted bread. Sprinkle each with about 1/4 cup cheese mixture.
Broil 3 to 5 inches from heat for 1 to 3 minutes or until cheese is bubbly.