Add cream to a saucepan, and bring to a boil. Stir continuously, as cream thickens, for about 3 minutes. Reduce heat to medium-low, and add mustard and cheese. Stir until cheese has melted and mustard is incorporated, about 2 minutes. Season with salt and pepper. 

Add cream to a saucepan, and bring to a boil. Stir continuously, as cream thickens, for about 3 minutes. Reduce heat to medium-low, and add mustard and cheese. Stir until cheese has melted and mustard is incorporated, about 2 minutes. Season with salt and pepper.