With one last chance to make it to the finale, the four remaining bakers must make historic Mont Blanc cakes - tarts topped with a tower of chestnut paste - in the Skills Challenge. In the Master Challenge, host Scott Conant instructs the bakers to make a Charlotte Royale - a visually stunning cake also known as "brain cake" - with peanut butter as the featured flavor. Guest judge and acclaimed pastry chef Florian Bellanger, joinsJason Smith and Marcela Valladolid, with one more baker's dreams being dashed.