1 medium head fresh green cabbage, cored and shredded

12 oz cooked corned beef, shredded or diced

1/2 cup diced yellow onion

2 cloves garlic, finely minced

2 tbsp unsalted butter

1 tsp fresh thyme leaves

1/2 tsp sea salt

1/2 tsp coarse black pepper

2 tbsp unsalted butter

4 oz full-fat cream cheese, softened and cubed

1 cup unsalted beef bone broth

1/2 cup heavy whipping cream

2 tbsp whole-grain stone-ground mustard

1 tbsp Dijon mustard

1/4 tsp ground nutmeg

1/4 tsp freshly cracked black pepper

1 1/2 cups shredded sharp white cheddar cheese

1/4 cup finely grated Parmesan cheese

2 tbsp fresh flat-leaf parsley, finely chopped