Preheat the oven to 200C.
Put a large pan of water on to boil. Put the gnocchi and broccoli in the water until al dente and drain.
While the gnoc 'n' broc cooks, measure the cornflour into a bowl. Blend in a little yoghurt, stir in the eggs and whisk until smooth. Mix in the remaining yoghurt, cheeses and the mustard.
Get an oven-safe dish over a low heat. If you're using the bacon, fry it quickly until crispy. Whizz up half the bacon and bread in a food processor and keep to one side for a moment.
Add the gnocchi, broccoli and the other half of the bacon to the cheese sauce, adding a little milk if required to let it down. Top with the bacony breadcrumbs and bake for 20 mins, or until puffy and golden.
