There could be a few reasons why your eggs stick to your cast iron skillet. Here are some possible factors to consider:
Insufficient Seasoning: Cast iron skillets require a well-seasoned surface to develop a natural non-stick coating. If your skillet is relatively new or hasn't been properly seasoned, it may not provide the necessary non-stick properties. Seasoning involves applying a layer of oil to the skillet and heating it to create a polymerized coating. Ensure that your skillet is adequately seasoned by following the manufacturer's instructions or by seasoning it yourself.
Inadequate Preheating: Preheating the cast iron skillet before adding the eggs is crucial. Cast iron takes longer to heat up compared to other materials, but once it reaches the desired temperature, it distributes heat evenly. If you add eggs to a cold or insufficiently preheated skillet, they are more likely to stick. Preheat your skillet on low to medium heat for a few minutes before adding any ingredients.
Insufficient Fat: Eggs need fat to prevent sticking. If you're using a minimal amount of fat or cooking spray, it might not be enough to create a proper non-stick surface. Consider adding more butter, oil, or cooking fat of your choice to the skillet before adding the eggs. This extra fat helps create a barrier between the eggs and the surface, reducing the chances of sticking.
High Heat: While cast iron skillets are known for their heat retention properties, using excessively high heat can cause the eggs to stick. Cast iron conducts heat well, so medium to medium-low heat is often sufficient for cooking eggs. Avoid using high heat settings, as they can lead to uneven cooking and increase the likelihood of sticking.
Timing and Technique: Eggs can be delicate and require a gentle touch. Make sure you're not leaving the eggs in the skillet for too long without flipping or stirring them. Use a spatula to gently loosen the eggs from the skillet to prevent them from sticking. Cooking eggs slowly and at a lower temperature can also help prevent sticking.
Remember that cast iron cookware may require a bit of practice and experimentation to achieve the desired non-stick results. Over time, as the seasoning improves and you become familiar with your skillet's characteristics, you should notice better non-stick performance when cooking eggs.