Making an Omelette with fillings is just as simple as making it plain! Better yet, making it with crab meat is just as easy and even more delicious! Once you've poured your batter into the skillet, wait until the edges start firming, then add your fillings to the omelette, just before you fold it. You want to make sure the bottom has firmed up as well so the filling doesn't sink to the bottom of the pan.