When ready to serve, heat a nonstick sauté pan over medium heat, adding 2 tablespoons of butter. Just as the butter stops foaming, add half of the spätzle and toss to coat, seasoning with salt and pepper. Let the noodles sit, not stirring or moving the pan for 4 – 5 minutes, to lightly brown the noodles, adding a light crust to some of them. Add half of the parsley and toss, cooking another 3 – 4 minutes. Transfer to a serving platter, keeping warm as the next batch is preparing. If you have two pans, you can do side-by-side batches to speed up serving.