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Heat oil in a small saucepan. Add onions and cook over low heat with a lid on for 10 minutes, stirring often, until very soft and starting to caramelise. Add sugar and vinegar and cook for a further 5 minutes. Set aside to cool.
Preheat oven to 180C fan-forced. Grease a deep 24cm pie dish.
In a large bowl, whisk eggs and milk. Whisk in flour and soup mix until smooth. Stir through cheese, parsley and caramelised onions. Pour into prepared dish.
Bake for 35 minutes until quiche has just set. Allow to cool slightly before slicing and serving. Watch our step-by-step video below to see how to make the French onion impossible quiche recipe.