Combine Creamy Cheese Sauce, yolks, cheese, and butter in top of double boiler; place over boiling water. Reduce heat to low, stirring constantly until cheese and butter are melted. Remove from heat; let cool. Fold in whipped cream.
Trim crust from toast. Arrange toast slices on a lightly greased baking sheet; top each with 2 ounces chicken and 1/8 cup cream sauce. Broil 4 inches from heat until sauce is bubbly. Garnish with bacon slices.