This is so easy to do and it is fail proof! The filling is as good as your imagination, try different combinations. Blue cheese adds some zest. I usually make my filling and keep it warm in the oven while I cook the omelette. I often use 3 tbsp whipped cottage cheese instead of the sour cream. I think my favorite omelette is filled with cheddar cheese, jalapeno pepper, crumbled bacon and mushrooms - I fry the mushrooms and jalapeno for just a minute or two and I add the ceddar to the omelette in the last minute of cooking This is a new favorite filling that I just had. I didn't want to make a new recipe because this is the base recipe. - 3/4 cup fried mushrooms, 1/2 cup chopped, cooked chicken, 1tsp hot cajun spice, 1/4 cup shredded lite gouda cheese (or your own favorite), 4 tbsp hot salsa. Fry the mushrooms in a bit of butter or Pam, add chicken & Cajun spice - heat-remove from pan and keep warm-Cook your omelet-add cheese & chicken/ mushrooms when it is just about cooked to one side of the omelet. flip closed, after 1-2 minutes served with the salsa on top!