Bring a large pot of salted water to a boil.
Meanwhile, warm the cream and melt butter in a large skillet over medium heat.
Stir in the crumbled gorgonzola cheese.
Mix until the cheese is melted and the sauce is smooth, about 3 minutes.
Taste and season with salt and pepper, and a grating of nutmeg. Reduce the heat to low and continue to cook until the sauce is velvety and rich, 3 to 4 minutes more.
Meanwhile, Add the gnocchi to the boiling water and cook according to the package instructions, or until tender and pillowy, 2 to 5 minutes. Drain the gnocchi.
Stir the drained gnocchi into the sauce to coat, being mindful not to smush the tender pillows.
Divvy the gnocchi and sauce among warm bowls and top with the chopped hazelnuts. Serve at once.