Assemble: While everything is still hot, stir together cooked spaetzle, caramelized onions, and shredded cheeses. If cheese doesn't melt completely, cover and transfer to a warm oven for a few minutes.
Assemble: While everything is still hot, stir together cooked spaetzle, caramelized onions, and shredded cheeses. If cheese doesn't melt completely, cover and transfer to a warm oven for a few minutes.