Step 1

Preheat oven to 300 degrees F (150 degrees C).

Step 2

Fill a large pot with lightly salted water and bring to a rolling boil. Stir in egg noodles and return to a boil. Cook noodles uncovered, stirring occasionally, until tender but still slightly firm, about 5 minutes. Drain well.

Step 3

Melt 1/2 cup butter in a large skillet over medium-low heat; cook and stir onions until translucent, 5 to 10 minutes.

Step 4

Cook and stir remaining butter and cabbage into onions until cabbage is softened but not browned, 5 to 8 more minutes. Season with salt and black pepper.

Step 5

Place cooked noodles and cabbage mixture in a large roasting pan and stir gently to combine. Sprinkle with more salt and black pepper if desired.

Step 6

Bake in the preheated oven until golden brown on top, 30 to 40 minutes.