Step 1: 1) Use three eggs and mix them up in a bowl.
Step 2: 2) Heat the pan and put butter/olive oil in it. Pour the two-thirds of the egg in.
Step 3: 3) Then, sprinkle: diced peppers, diced mushrooms, diced tomatoes, grated cheese and shredded chicken.
Step 4: 4) Add salt to taste.
Step 5: 5) Then pour the remaining one-third of the egg over the omelette in the pan. Let it cook for a while.