Cook the egg noodles according to package instructions until al dente. Drain and set aside.

In a large skillet, melt the butter over medium heat. Add the chopped onion and saut? until translucent, about 5 minutes.

Add the shredded cabbage to the skillet and cook, stirring occasionally, until the cabbage is tender and slightly caramelized, about 15-20 minutes.

Add the cooked noodles to the skillet with the cabbage and onion. Season with salt and pepper, and toss to combine.

Serve hot as a main dish or side dish.