Before filling, what should be done to muffin tins and loaf pans?

Greasing muffin tins and loaf pans with shortening and dusting with flour is an effective method to ensure that baked goods do not stick during the baking process. Shortening provides a solid fat that creates a barrier between the batter and the pan surface, which helps to facilitate easy release. Dusting with flour further enhances this non-stick capability by providing a layer that absorbs any excess moisture from the batter, contributing to a smoother release of the baked product after cooling.

This technique is often recommended because it minimizes the chances of damaging the delicate structure of muffins and loaves when removing them from their baking vessels. Proper preparation of the pans not only preserves the appearance of the baked goods but also helps maintain their texture and integrity.

While other methods, such as using parchment paper, butter alone, or non-stick spray, can be effective in certain contexts, the combination of greasing with shortening and dusting with flour offers a time-tested approach that is versatile and reliable in a variety of baking scenarios.