This is a tricky one! I used a non-stick cake pan and then added a generous coating of cooking spray before adding my ingredients. This is your best bet to prevent sticking. I would also avoid stirring your ingredients once they are in the pan; otherwise, you run the risk of sticking since you’re wiping the greasy coating off. You can always toss your ingredients together in a large bowl so they are evenly distributed then add to the cake pan and pour the egg mixture in.