Carefully remove the outer leaves from the cabbage, then blanch the cabbage in the boiling water for 3-4 minutes until softened.
Remove the cabbage and let it cool slightly.
Reserve 8 large cabbage leaves for wrapping.
In a large bowl, mash the boiled potatoes.
Add the chopped onion, parsley, sour cream, olive oil, salt, pepper, and breadcrumbs (if using).
Mix well to combine.
Place a cabbage leaf on a flat surface.
Spoon a generous amount of the potato mixture onto the center of the leaf.
Fold the sides of the cabbage leaf over the filling and roll tightly, securing the stuffing inside.
Place the cabbage rolls seam-side down in a casserole dish.
Pour the vegetable broth over the cabbage rolls.
Cover the dish with aluminum foil and bake at 350°F (175°C) for 1 hour, or until the cabbage is tender.
Serve warm, optionally garnished with additional parsley and a dollop of sour cream.
Notes / Tips / Wine Advice:
Serving Tip:Serve with a side of pickled vegetables or a light salad for a complete, balanced meal.Wine Advice:A light white wine such as a Grüner Veltliner or a crisp Chardonnay complements the comforting flavors of the potato-stuffed cabbage rolls.