Step 1: Preheat oven to 180C/160C fan forced.
Step 2: Whisk the 2 whole eggs, the 4 yolks and the cream in a large bowl.
Step 3: Using an electric mixer, beat egg whites in a large, clean, dry bowl until soft peaks form.
Step 4: Using a large metal spoon, gently fold egg white mixture into the egg yolk mixture until just combined.
Step 5: Heat a large non-stick ovenproof frying pan over moderate heat; spray with oil and then pour in egg mixture, top with ham, cheese and tomato and cook for 3 minutes or until golden brown underneath and then bake for 10 minutes or until just set at the centre.
Step 6: Whisk extra cream and mustard in a small bowl.
Step 7: Sprinkle omelette with chives and serve with mustard cream.
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