Heat up a pan and melt 1 tbs butter. Fry onion golden and crispy. Take out onion fro slices/rings the pan and keep aside
Bring skillet back to the heat and melt the remaining 1 tbs butter. Add cooked spaetzle noodles to the pan (make sure they are not wet!) and fry noodles on all sides.
Season with salt and black pepper. Spread crispy onion over the noodles in the pan.
Sprinkle grated cheese over noodles.
Keep the skillet over slow heat, cover with a lid and let the cheese melt OR if it's an oven-friendly skillet (check info that came with your skillet) keep in the oven under the grill.
Serve hot, garnished with some fresh parsley or green chopped chives.
Video
Notes
Pick a flavorful Cheese such as a full-bodied Cheddar, Emmenthal, Gruyere, Beer Cheese, Alpine Cheese or add a few assorted kinds of cheese in one pan.