If you are using leftover baked potatoes, they will need to be warmed up again or the gnocchi will taste doughy - put them into a warm oven for 10 minutes or microwave on high for 30 seconds.
Carefully add your gnocchi to the pan, taking care not to overcrowd, and poach for 10-15 minutes, turning occasionally. Meanwhile, gently reheat the tomato sauce.
In a bowl, combine the hot potato purée with the flour, egg yolks, 6 tablespoons Parmigiano, and a pinch of salt; mix briefly with your hands until combined. Place the gnocchi dough on a counter ...
Heat oil in a large nonstick skillet over medium-high heat until shimmering. Add gnocchi, breaking up any clumps. Cook, stirring often and adjusting heat if gnocchi start to brown too fast ...