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Export 4 ingredients for grocery delivery
Step 1
Preheat the oven to 400 degrees F. Butter a 9x13 (or a little smaller) casserole dish.
Step 2
To make the caramelized onions: Melt the butter in a medium-sized heavy stock pot or Dutch oven. Add the onions and stir occasionally for 20-30 minutes until deeply caramelized. Halfway into it sprinkle with a little salt and sugar to help with the caramelizing. Get the onions nice and brown.
Step 3
Layer 1/3 of the Spätzle in the bottom of the dish followed by 1/3 of the cheese and 1/3 of the caramelized onions. Repeat, sprinkling each layer with some salt, ending with cheese and onions on top.
Step 4
Bake for 10 minutes or longer until the cheese is melted and the edges are just beginning to get a little crispy.Serve immediately. This makes great leftovers!