Step 1

Preheat oven to 350 degrees F (175 degrees C).

Step 2

Heat 6 tablespoons butter in a large skillet over medium heat; cook and stir onion in the melted butter until lightly browned, 10 to 15 minutes.

Step 3

Remove and set aside several large leaves of cabbage. Core cabbage and cut into very fine shreds. Mix cooked onion, chopped cabbage, eggs, and milk together in bowl; transfer mixture to a 9x13-inch casserole dish. Cover mixture with reserved whole cabbage leaves.

Step 4

Bake in the preheated oven until cabbage mixture is cooked through and set, about 50 minutes.

Step 5

Heat 2 tablespoons butter in a skillet over medium heat; cook and stir cracker crumbs in the melted butter until lightly browned, about 5 minutes.

Step 6

Remove cabbage leaves from top of casserole dish and sprinkle cabbage-egg mixture with buttered cracker crumbs.

Step 7

Bake in the preheated oven until topping is browned, about 10 more minutes. Season with salt and black pepper.