Spaetzle With Kielbasa and Caramelized Onions

Spaetzle is basically a blank, buttery canvas that will absorb whatever flavorings you care to mix into it. I’ve served the dumplings plain with melted butter and chopped chives. I’ve crisped them in a pan of brown butter and almonds. I’ve topped them with hearty beef stew. But layered with cheese a...