white mushrooms (about 300 g) • chopped chives (about 30 g) • diced onions (about 100 g) • fresh gnocchi (about 500 g) • garlic (about 20 g) • unsalted butter (about 110 g) • all-purpose flour (about 50 g) • milk (about 1/2 liter) • egg yolks • shredded Swiss cheese (Gruyère or similar) • ham steak (about 300 g) • Salt and pepper
