For the cheese sauce, heat the butter in a frying pan over a medium heat and fry the onion and garlic until soft.
Add the white wine and simmer until reduced by half. Add the double cream and simmer gently.
Stir in the cheese, season well with salt and freshly ground black pepper and warm through until the cheese has melted.
For the gnocchi, place the gnocchi into a serving bowl and drizzle with oil. Season, to taste, with salt and freshly ground black pepper and stir.
To serve, pour the sauce over the gnocchi.
