Fond, the flavorful browned bits left in a pan after cooking, is difficult to create in non-stick pans because they are designed to prevent sticking, which is essential for fond formation. While some minimal fond might develop, it won't be as rich or abundant as in stainless steel or cast iron.
Fond is created through the Maillard reaction, a chemical reaction between amino acids and reducing sugars that gives browned food its distinctive flavor. This reaction occurs at high temperatures and requires direct contact between the food and the hot pan surface. Non-stick pans, by design, have a coating that prevents food from sticking, thus hindering the Maillard reaction and the formation of fond. The coating creates a barrier, reducing the direct heat transfer needed for browning and flavor development. While you might get some browning around the edges of food cooked in a non-stick pan, the majority of the flavorful residue will not form. For optimal fond creation, use pans made of materials like stainless steel, cast iron, or carbon steel, which allow for better heat transfer and sticking. These materials encourage the Maillard reaction, resulting in a richer, more complex fond.
If you absolutely must use a non-stick pan, try searing at a slightly higher temperature than usual (but be careful not to overheat the pan and damage the coating). Pat the food dry before searing to encourage browning, and avoid overcrowding the pan, which can lower the temperature and prevent fond formation.