In a mixing bowl, combine the flour and salt. Make a well in the center and add eggs and milk. Mix until you achieve a smooth batter that should be a bit thicker than pancake batter.

In a large pot, bring salted water to a rolling boil.

Using a spätzle maker or a colander, push the batter through to form noodle shapes directly into the boiling water. This process can be a fun, hands-on experience!

Allow the noodles to cook for 2-4 minutes or until they float to the surface, signaling they are ready. Remove them with a slotted spoon and drain.

In a skillet, melt some butter and add thinly sliced onions. Cook over medium heat until caramelized, about 10 minutes.

In a greased baking dish, layer half of the cooked noodles, then sprinkle half of the cheese. Repeat the layers one more time.

Top with additional butter and bake at 350°F for about 20 minutes until the cheese is bubbling and golden.

Garnish with freshly chopped chives if desired, and enjoy this authentic dish!