Preheat oven to a true 350°F (using an oven thermometer ensures that you get to the right temperature!).
Sift the 320 g flour, 1 tsp salt, 1/2 tsp baking soda, 1/2 tsp cinnamon, and 1/8 tsp nutmeg into a medium-sized bowl.
Thoroughly combine sour cream, 135 g (~1/2 cup) cooled chunky peach puree, pure vanilla extract, and triple sec (if using) in a small bowl.
Begin with Butter Masterclass-Basic Cake Decorating Techniques (July 2022)