Whisk the flour with the nutmeg, 1 teaspoon salt, and a few grinds of pepper in a large bowl. Make a well in the center and add the eggs and milk. Gradually mix the milk and eggs into the flour to make a sticky batter.
Spray both sides of a colander with 1/4-inch-wide holes (see Cook's Note) with cooking spray then spoon the batter into the colander. Hold the colander directly above the pot of boiling water (using an oven mitt if necessary) and working quickly, use a rubber spatula to push the batter through the holes into the water. Simmer until all of the spaetzle float to the surface and are tender, about 2 minutes. Drain and transfer to a bowl. Toss the spaetzle with the butter and sprinkle with herbs, if using.
Use a spaetzle maker for bigger noodles.
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