Sweet Potato Gnocchi - Gnocchi di patate dolci

Gnocchi

• 100 g Parmesan cheese cut in pieces (2 cm)
  ou vegetarian hard cheese cut in pieces (2 cm)
• 450 g sweet potatoes peeled, sliced (3 cm)
• 1000 g water plus extra for cooking gnocchi
• 150 g plain flour plus extra for dusting
• ½ tsp garlic powder
• 1 tsp fine sea salt

Gorgonzola Sauce

• 20 g plain flour
• 1 ½ tsp fine sea salt
• 20 g unsalted butter
• 300 g milk
• 100 g Gorgonzola piccante, cut in pieces
• 2 Tbsp fresh chives finely chopped