01 -
Slice the onions into small, thin pieces. Grate your cheeses. Have all your ingredients prepped so you're ready to go, especially for making the spaetzle.
02 -
Melt butter in a big pan, toss in the onions, and sprinkle with salt. Keep it on super low heat and stir them often as they slowly turn golden brown. This takes about 45 minutes. Start with medium heat if needed, and lower it once onions start cooking.
03 -
While you caramelize the onions, follow the steps to prepare the spaetzle noodles.
04 -
Put the spaetzle into a casserole dish, mix in a few pieces of butter, then add the grated cheese. Once the onions are done, layer them on top of the cheese.
05 -
Slide the dish into the oven and bake for about 10–15 minutes, until the cheese is gooey and starts bubbling.
06 -
Serve fresh and warm with a sprinkle of parsley if you'd like.