Prep the sage: Rinse or clean the fresh sage, pat dry, and chop, but set aside some for garnish later. If using dried sage, chop it finely or crumble it with your fingers.
Sauté the gnocchetti: Heat the olive oil in a large pan over high heat. Add the gnocchetti and sauté, stirring often, until they begin to brown.
Add the sage: Stir in the sage (except for the small portion you saved). Continue frying until the gnocchetti are golden and the sage is fragrant.
Finish the dish: Remove from heat. Add the nutritional yeast and lemon juice, and stir to combine.
Season: Taste and season with a little salt and pepper (and more lemon juice if desired).