Käsespätzle is Germany’s answer to mac and cheese—tender egg noodles tossed with melted Emmental, a touch of cream, and chives, finished under the broiler for a golden, bubbly top. It’s hearty enough for a festive Oktoberfest meal yet simple enough for weeknight comfort.
Whisk together the shredded Emmental, heavy cream, and chopped chives in a bowl until evenly combined.
Melt the butter in a 9- or 10-inch cast-iron skillet over medium heat until it begins to shimmer.
Add the spaetzle to the hot skillet and cook over medium-high heat, stirring occasionally, until pieces develop golden edges and a bit of crispness, about 5–8 minutes.
Pour the cheese and cream mixture over the spaetzle and stir until the cheese has melted and the noodles are thoroughly coated.
Place the skillet under a preheated broiler for 1–2 minutes until the top turns golden and bubbly—watch closely to avoid burning.
Remove from the oven, sprinkle with additional chopped chives and crispy fried onions, and serve immediately.