Bring a large pot of slightly salted water to a boil.
In the meantime heat a small saucepan with the olive oil. When hot, carefully place a couple of sage leaves at the time, and fry for about 10 seconds. Remove the leaves and pat dry on kitchen paper. Crash with your hands half of the leaves and save for later.
Heat a skillet over medium-low heat. Melt the butter and continue to cook until it turns slightly brown, about 1-2 min.
Cook gnocchi in the pot with soft-boiling water, for 1-2 minutes until they rise on the surface.
Spoon them out with a slotted spoon, mix them in the skillet with the melted butter, and sprinkle the previously crushed sage.
Top your gnocchi with black pepper, the remaining fried sage leaves and Parmesan shavings, and serve immediately.